San Diego official believes electric vehicle percentage is lower than state average. Therefore :
Null hypothesis: p = 0.27, alternative hypothesis: p < 0.27. With a test statistic of -2.96 and a significance level of 5%, the null hypothesis is rejected, supporting the claim that the percentage of Californians driving electric vehicles is lower in San Diego.
1. State the null and alternative hypotheses. The null hypothesis is that the percentage of Californians driving electric vehicles is equal to 27%. The alternative hypothesis is that the percentage is lower in San Diego.
[tex]H_0[/tex]: p = 0.27
[tex]H_1[/tex]: p < 0.27
where p is the true percentage of Californians driving electric vehicles in San Diego.
2. Choose a significance level. The significance level is the probability of rejecting the null hypothesis when it is true. In this case, we will use a significance level of 5%, which means that we are willing to accept a 5% risk of making a Type I error (rejecting the null hypothesis when it is true).
3. Calculate the test statistic. The test statistic is a number that is used to compare the observed data to the expected data under the null hypothesis. In this case, the test statistic is calculated as follows:
[tex]\[t = \frac{p_\hat{} - p_0}{SE}\][/tex]
where [tex]p_hat[/tex] is the sample proportion of electric vehicles, p_0 is the hypothesized population proportion, and SE is the standard error of the sample proportion.
[tex]\[t = \frac{0.20 - 0.27}{0.027}\][/tex]
= -2.96
4. Determine the critical value. The critical value is the value of the test statistic that separates the rejection region from the non-rejection region. The critical value is determined by the significance level and the degrees of freedom. In this case, the degrees of freedom are 149.
[tex]t_critical[/tex] = -1.645
5. Compare the test statistic to the critical value. If the test statistic is more extreme than the critical value, then we reject the null hypothesis. In this case, the test statistic (-2.96) is more extreme than the critical value (-1.645), so we reject the null hypothesis.
6. Interpret the results. We can conclude that there is sufficient evidence to support the city official's claim that the percentage of Californians driving electric vehicles is lower in San Diego than in the rest of California.
It is important to note that this is just one possible interpretation of the results. There could be other explanations for the observed results, such as a sampling error or a change in the population over time.
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Complete question :
Question 7: According to the Sacramento Bee newspaper, 27% of Californians are driving electric vehicles. A city official believes that this percentage is lower in San Diego. A random sample of 150 vehicles found that 30 were electric vehicles. Test the city officials claim at a significance level of 5%. Show every step in your process and interpret your results.
for the function f(x)=x4−2x2 3. Determine the inflection point(s) of f .
the answers should be in ascending order of x values. use decimals (rounded to 2 decimal places).
The inflection points of the function f(x) = x⁴ - 2x²/3 are at
x = -0.77 and x = 0.77.
To find the inflection points of the function f(x) = x⁴ - 2x²/3, we need to locate the x-values where the concavity of the function changes.
This can be done by finding the second derivative of the function and determining where it equals zero.
First, let's find the second derivative of f(x):
f''(x) = 12x² - 4x/3
Setting f''(x) equal to zero and solving for x:
12x² - 4x/3 = 0
4x(3x - 1) = 0
This equation is satisfied when x = 0 and x = 1/3. However, we need to check the concavity around these points to confirm if they are inflection points.
By analyzing the sign of f''(x) in the intervals (-∞, 0), (0, 1/3), and (1/3, ∞), we observe that the concavity changes at x = -0.77 and x = 0.77.
These are the inflection points of the function f(x).
Therefore, the inflection points of f(x) = x⁴ - 2x²/3 are at x = -0.77 and x = 0.77.
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find the unique solution to the differential equation that satisfies the stated = y2x3 with y(1) = 13
Thus, the unique solution to the given differential equation with the initial condition y(1) = 13 is [tex]y = 1 / (- (1/4) * x^4 + 17/52).[/tex]
To solve the given differential equation, we'll use the method of separation of variables.
First, we rewrite the equation in the form[tex]dy/dx = y^2 * x^3[/tex]
Separating the variables, we get:
[tex]dy/y^2 = x^3 * dx[/tex]
Next, we integrate both sides of the equation:
[tex]∫(dy/y^2) = ∫(x^3 * dx)[/tex]
To integrate [tex]dy/y^2[/tex], we can use the power rule for integration, resulting in -1/y.
Similarly, integrating [tex]x^3[/tex] dx gives us [tex](1/4) * x^4.[/tex]
Thus, our equation becomes:
[tex]-1/y = (1/4) * x^4 + C[/tex]
where C is the constant of integration.
Given the initial condition y(1) = 13, we can substitute x = 1 and y = 13 into the equation to solve for C:
[tex]-1/13 = (1/4) * 1^4 + C[/tex]
Simplifying further:
-1/13 = 1/4 + C
To find C, we rearrange the equation:
C = -1/13 - 1/4
Combining the fractions:
C = (-4 - 13) / (13 * 4)
C = -17 / 52
Now, we can rewrite our equation with the unique solution:
[tex]-1/y = (1/4) * x^4 - 17/52[/tex]
Multiplying both sides by -1, we get:
[tex]1/y = - (1/4) * x^4 + 17/52[/tex]
Finally, we can invert both sides to solve for y:
[tex]y = 1 / (- (1/4) * x^4 + 17/52)[/tex]
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what is the most nearly volume created when the area bounded by y=0, x=0, and y=sq. rt.(4-x^2) is rotated about y-axis?
a) 3.1
b)8.4
c)17
d)34
Answer of the above question is in the correct option is (b) 8.4.
Given the area bounded by y = 0, x = 0, and y = √(4 - x²) and we need to find the most nearly volume created when it is rotated about the y-axis.What we need is the calculation of the volume created by a rotation around the y-axis using the formula given below:V = π∫ [f(y)]² dy, where f(y) is the radius, and the limits of the integral are the values of y.Volume of the generated solid (V) by rotating the area bounded by y = 0, x = 0, and y = √(4 - x²) about the y-axis can be calculated as follows:
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A recent report stated that less than 35 percent of the adult residents in a certain city will be able to pass a physical fitness test. Consequently, the city's Recreation Department is trying to convince the City Council to fund more physical fitness programs. The council is facing budget constraints and is skeptical of the report. The council will fund more physical fitness programs only if the Recreation Department can provide convincing evidence that the report is true. The Recreation Department plans to collect data from a sample of 185 adult residents in the city. A test of significance will be conducted at a significance level of a = 0.05 for the following hypotheses. H: p=0.35 H:p<0.35, where p is the proportion of adult residents in the city who are able to pass the physical fitness test. (a) Describe what a Type II error would be in the context of the study, and also describe a consequence of making this type of error. (b) The Recreation Department recruits 185 adult residents who volunteer to take the physical fitness test. The test is passed by 77 of the 185 volunteers, resulting in a p-value of 0.97 for the hypotheses stated above. If it was reasonable to conduct a test of significance for the hypotheses stated above using the data collected from the 185 volunteers, what would the p-value of 0.97 lead you to conclude? (c) Describe the primary flaw in the study described in part (b), and explain why it is a concern.
(a) In the context of the study, a Type II error would occur if the Recreation Department fails to reject the null hypothesis (H: p = 0.35) when it is actually false (H: p < 0.35).
(b) A p-value of 0.97 would lead us to conclude that there is not enough evidence to reject the null hypothesis (H: p = 0.35).
(c) The primary flaw in the study described in part (b) is the use of a sample size that may be too small to provide reliable and accurate results.
How to explain the informationa. In the context of the study, a Type II error would occur if the Recreation Department fails to reject the null hypothesis (H: p = 0.35) when it is actually false (H: p < 0.35). In other words, it would mean that the department fails to find convincing evidence that less than 35 percent of the adult residents in the city can pass the physical fitness test, even though it is true.
(b) A p-value of 0.97 would lead us to conclude that there is not enough evidence to reject the null hypothesis (H: p = 0.35). Since the p-value is greater than the significance level of 0.05, we fail to find strong evidence to support the claim that less than 35 percent of the adult residents in the city can pass the physical fitness test. Therefore, based on this result, it would not be reasonable to conclude that the report stating less than 35 percent of adults can pass the test is true.
(c) The primary flaw in the study described in part (b) is the use of a sample size that may be too small to provide reliable and accurate results. The study collected data from only 185 adult residents who volunteered to take the physical fitness test. This sample size might not be representative enough to draw conclusions about the entire population of adult residents in the city.
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use the definition of taylor series to find the taylor series (centered at c) for the function. f(x) = 7 sin x, c = 4
The Taylor series is a way to represent a function as a power series of its derivatives at a specific point in the domain. It is a crucial tool in calculus and its applications. The Taylor series for a function f(x) is given by:$$f(x) = \sum_{n=0}^\infty \frac{f^{(n)}(c)}{n!}(x-c)^n$$Where f^(n) (c) is the nth derivative of f evaluated at c.
In this case, we are asked to find the Taylor series centered at c=4 for the function f(x)=7sin(x).We first find the derivatives of f(x). The first four derivatives are:$f(x)=7sin(x)$;$f'(x)=7cos(x)$;$f''(x)=-7sin(x)$;$f'''(x)=-7cos(x)$;$f''''(x)=7sin(x)$;Notice that the pattern repeats after the fourth derivative. Thus, the nth derivative is:$f^{(n)}(x)=7sin(x+\frac{n\pi}{2})$Now, we can use the formula for the Taylor series and substitute in the derivatives evaluated at c=4:$f(x)=\sum_{n=0}^\infty \frac{7sin(4+\frac{n\pi}{2})}{n!}(x-4)^n$.
Thus, the Taylor series for f(x)=7sin(x) centered at c=4 is:$$7sin(x)=\sum_{n=0}^\infty \frac{7sin(4+\frac{n\pi}{2})}{n!}(x-4)^n$$.
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2 Which statistical tool defines the prediction for the dependent variable? (1 Point) Correlation O Regression O t-test Confidence Interval
The statistical tool that defines the prediction for the dependent variable is regression. Regression analysis is a statistical tool that defines the prediction for the dependent variable.
Regression analysis is used to examine the relationship between one dependent variable (usually denoted as Y) and one or more independent variables (usually denoted as X). It involves the calculation of the equation that best describes the relationship between these variables.
The equation is then used to make predictions about the dependent variable. Regression analysis is widely used in business, economics, and social science research to identify the factors that affect the outcome of a particular phenomenon.
For instance, a business can use regression analysis to determine how various factors such as advertising, price, and location affect the sales of a product. The results of the analysis can then be used to develop a marketing strategy that will increase the sales of the product. In conclusion, regression analysis is an important statistical tool that defines the prediction for the dependent variable.
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find the values of x for which the series converges. (enter your answer using interval notation.) [infinity] (−2)nxn n = 1 find the sum of the series for those values of x.
The series converges for -1/2 < x < 1/2. The sum of the series for those values of x is S = (-2x) / (1 + 2x).
To determine the values of x for which the series converges, we need to consider the convergence of the geometric series. A geometric series converges when the absolute value of the common ratio is less than 1.
In this case, the series is given by:
[tex]∑ (-2)^n * x^n[/tex], where n = 1 to infinity.
To find the convergence values, we need to consider the common ratio, which is (-2x). We want the absolute value of (-2x) to be less than 1:
|-2x| < 1
Simplifying this inequality, we have:
2|x| < 1
Dividing by 2, we get:
|x| < 1/2
So, the values of x for which the series converges are -1/2 < x < 1/2.
To find the sum of the series for those values of x, we can use the formula for the sum of a convergent geometric series:
S = a / (1 - r),
where a is the first term and r is the common ratio.
In this case, the first term a is given by [tex]a = (-2x)^1[/tex]
= -2x.
The common ratio r is (-2x).
Therefore, the sum of the series for the values of x in the interval (-1/2, 1/2) can be found as:
S = (-2x) / (1 - (-2x)) = (-2x) / (1 + 2x).
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The sum of the series for the values of x in the interval (-1/2, 1/2) is (-2x) / (1 + 2x).
To determine the values of x for which the series converges and find the sum of the series for those values, we need to analyze the given series:
∑ [infinity] (-2)^n * x^n, n = 1
This is a geometric series with the common ratio being -2x. For a geometric series to converge, the absolute value of the common ratio must be less than 1. In this case, we have:
| -2x | < 1
Let's solve the inequality to find the values of x:
|-2x| < 1
Since the absolute value of a number is always non-negative, we can remove the absolute value signs and split the inequality into two cases:
-2x < 1 and -2x > -1
Case 1: -2x < 1
Divide both sides by -2 (and reverse the inequality since we are dividing by a negative number):
x > -1/2
Case 2: -2x > -1
Divide both sides by -2 (and reverse the inequality):
x < 1/2
Therefore, the values of x for which the series converges are -1/2 < x < 1/2, or in interval notation:
(-1/2, 1/2)
To find the sum of the series for those values of x, we can use the formula for the sum of an infinite geometric series:
S = a / (1 - r)
Where "a" is the first term of the series and "r" is the common ratio. In this case, the first term "a" is (-2) * x and the common ratio "r" is -2x. Thus, the sum of the series is:
S = (-2x) / (1 - (-2x))
Simplifying further:
S = (-2x) / (1 + 2x)
Therefore, the sum of the series for the values of x in the interval (-1/2, 1/2) is (-2x) / (1 + 2x).
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What is the equation of the parabola opening upward with a focus at and a directrix of ?
A. f(x) = 1/32(x - 9)^2 + 19 =
B. f(x) = 1/32(x + 9)^2 + 19 =
C. f(x) = 1/16(x - 9)^2 + 19 =
D. f(x) = 1/16(x + 9)^2 - 19 =
The equation of the parabola opening upward with a focus at and a directrix is f(x) = 1/32(x - 9)² + 19
Therefore option A is correct.
How do we calculate?Our objective is to find the equation of the parabola opening upward with a focus at (9, 19) and a directrix of y = -19
The standard form of the equation of a parabola with a vertical axis is:
4p(y - k) = (x - h)²
(h, k) = (9, 0) we know this because the focus lies on the x-axis and the directrix is a horizontal line.
The distance between the vertex and the focus = 19.
4 * 19(y - 0) = (x - 9)²
76y = (x - 9)²
y = 1/76(x - 9)²
Comparing this equation to the options provided, we see that the likely answer is: A. f(x) = 1/32(x - 9)² + 19
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y=3x-7 Work out the value of y when x=5
Step-by-step explanation:
you know how functions work ?
the variable (or variables) in the findings expression is a placeholder for actual values.
when we have an actual value, we put that into the place of the variable and then simply calculate.
x = 5
therefore, the functional calculation is
y = 3×5 - 7 = 15 - 7 = 8
keep in mind the priorities of mathematical operations :
1. brackets
2. exponents
3. multiplications and divisions
4. additions and subtractions
therefore, we need to calculate "3×5" before we deal with the "- 7" part.
Answer:
Step-by-step explanation:
y=8
Shadow A person casts the shadow shown. What is the approximate height of the person?
Answer:
height of person ≈ 6 ft
Step-by-step explanation:
using the tangent ratio in the right triangle.
let the height of the person be h , then
tan16° = [tex]\frac{h}{21}[/tex] ( multiply both sides by 21 )
21 × tan16° = h , then
h ≈ 6 ft ( to the nearest whole number )
The function y = e ^ (3x) - 5x + 7 is a solution to which of the following differential equations?
(A) y^ prime prime - 3 * y' - 15 = 0
(B) y^ prime prime - 3 * y' + 15 = 0
(C) y^ prime prime - y' - 5 = 0
(D) y^ prime prime - y' + 5 = 0
The correct answer is (A) y'' - 3y' - 15 = 0.
To determine which differential equation the function [tex]y = e^{3x} - 5x + 7[/tex] satisfies, we need to find the derivatives of y and substitute them into each differential equation.
Given function:
[tex]y = e^{3x} - 5x + 7[/tex]
First derivative:
[tex]y' = 3e^{3x} - 5[/tex]
Second derivative:
[tex]y'' = 9e^{3x}[/tex]
Substituting these derivatives into each differential equation:
(A) [tex]y'' - 3y' - 15 = 9e^{3x} - 3(3e^{3x} - 5) - 15 = 9e^{3x} - 9e^{3x} + 15 - 15 = 0[/tex]
(B) [tex]y'' - 3y' + 15 = 9e^{3x} - 3(3e^{3x} - 5) + 15 = 9e^{3x} - 9e^{3x} + 15 + 15 = 30 \neq 0[/tex]
(C) [tex]y'' - y' - 5 = 9e^{3x} - (3e^{3x} - 5) - 5 = 9e^{3x} - 3e^{3x} + 5 - 5 = 6e^{3x} \neq 0[/tex]
(D) [tex]y'' - y' + 5 = 9e^{3x} - (3e^{3x} - 5) + 5 = 9e^{3x} - 3e^{3x} + 5 + 5 = 11e^{3x} \neq 0[/tex]
From the above calculations, we can see that only option (A) y'' - 3y' - 15 = 0 satisfies the given function [tex]y = e^{3x} - 5x + 7[/tex].
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The mean is 10 and the standard deviation is 3.5. If the data
set contains 40 data values, approximately how many of the data
values will fall within the range of 6.5 to 13.5?
27 data values will fall within the range of 6.5 to 13.5.
Given the mean as 10 and the standard deviation as 3.5, we are required to determine the approximate number of data values that will fall within the range of 6.5 to 13.5 when the data set contains 40 data values.
What we need to do is to standardize the data values and convert them to z-scores. Once that is done, we can find out the probability of the data values being in the specified range using a z-score table.
Now, the formula for calculating the z-score is given as: z = (x - μ)/σ, where x = data value, μ = mean, and σ = standard deviation.
Applying the values from the question, we get:
z1 = (6.5 - 10)/3.5 = -1
z2 = (13.5 - 10)/3.5 = 1
Now, using the z-score table, we can find out the area under the normal distribution curve between these two z-scores, which will give us the probability of the data values falling within the specified range.
The area between -1 and 1 is approximately 0.6826 (or 68.26%).
Therefore, the approximate number of data values that will fall within the range of 6.5 to 13.5 is:
0.6826 * 40 = 27.3 (rounded to the nearest whole number)
Hence, approximately 27 data values will fall within the range of 6.5 to 13.5.
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1-- Voters in a particular city who identify themselves with one or
the other of two political parties were randomly selected and asked
if they favor a proposal to allow citizens with proper license
The aim of the study is to determine whether the majority of voters in the city supports a proposal to allow licensed citizens to carry weapons in public areas.
In order to do so, voters who identified themselves with one or the other of two political parties were randomly selected, and they were asked if they favor the proposal.It is essential to ensure that the sample size is adequate, and the sample is representative of the entire population. The sample size should be large enough to reduce the chances of errors and to increase the accuracy of the results. The sample must be representative of the entire population so that the results can be generalized. This ensures that the sample accurately reflects the opinions of the entire population.
There are several potential biases to consider when conducting this study.
For example, people who do not identify with either of the two political parties may have different views on the proposal, and the study would not capture their opinions.
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5 people are sitting around a table. Let x be the number of people sitting next to at least one woman and y be the number of people sitting next to at least one man. How many possible values of the ordered pair (x,y) are there? (For example, (5,0) is the pair if all 5 people are women, since all 5 people are sitting next to a woman, and 0 people are sitting next to a man.)
Let's consider the possible scenarios for the arrangement of the 5 people around the table in terms of their gender. Since there are only two genders, namely men and women, we can have the following cases:
All 5 people are women: In this case, each woman is sitting next to 4 other women, so x = 5 and y = 0. Therefore, the ordered pair is (5, 0).
4 people are women, and 1 person is a man: In this scenario, each woman is sitting next to 3 other women and the man. Thus, x = 4 and y = 1. The ordered pair is (4, 1).
3 people are women, and 2 people are men: In this case, each woman is sitting next to 2 other women and both men. Therefore, x = 3 and y = 2. The ordered pair is (3, 2).
2 people are women, and 3 people are men: Here, each woman is sitting next to 1 other woman and both men. Hence, x = 2 and y = 3. The ordered pair is (2, 3).
1 person is a woman, and 4 people are men: In this scenario, the woman is sitting next to all 4 men. So, x = 1 and y = 4. The ordered pair is (1, 4).
All 5 people are men: In this case, each man is sitting next to 4 other men, so x = 0 and y = 5. The ordered pair is (0, 5).
To summarize, we have the following possible ordered pairs: (5, 0), (4, 1), (3, 2), (2, 3), (1, 4), and (0, 5). Therefore, there are six possible values for the ordered pair (x, y).
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find the solution of the differential equation that satisfies the given initial condition. xy' y = y2, y(1) = −7
The solution to the given differential equation [tex]\(xy' - y = y^2\)[/tex] that satisfies the initial condition (y(1) = -7) is (y = -7x).
What is the particular solution of the differential equation with the initial condition, where [tex]\(xy' - y = y^2\)[/tex] and (y(1) = -7)?To solve the given differential equation [tex](xy' - y = y^2)[/tex] with the initial condition (y(1) = -7), we can use the method of separable variables.
First, we rearrange the equation by dividing both sides by [tex]\(y^2\):[/tex]
[tex]\[\frac{xy'}{y^2} - \frac{1}{y} = 1\][/tex]
Now, we separate the variables and integrate both sides:
[tex]\[\int \frac{1}{y}\,dy = \int \frac{1}{x}\,dx + C\][/tex]
where (C) is the constant of integration.
Integrating the left side gives:
[tex]\[\ln|y| = \ln|x| + C\][/tex]
Next, we can simplify the equation by exponentiating both sides:
[tex]\[|y| = |x| \cdot e^C\][/tex]
Since (C) is an arbitrary constant, we can combine it with another constant,[tex]\(k = e^C\):[/tex]
[tex]\[|y| = k \cdot |x|\][/tex]
Now, we consider the initial condition (y(1) = -7). Substituting (x = 1) and (y = -7) into the equation, we get:
[tex]\[-7 = k \cdot 1\][/tex]
Therefore, (k = -7).
Finally, we can write the solution to the differential equation with the initial condition as:
[y = -7x]
where (x) can take any value except (x = 0) due to the absolute value in the solution.
The solution to the given differential equation that satisfies the initial condition (y(1) = -7) is (y = -7x).
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Find the exact value of each expression, if it is defined. Express your answer in radians. (If an answer is undefined, enter UNDEFINED.)
(a) sin (3)
(b) cos-4 - )
(C) tan (- 15).
a) The exact value of sin 3 in radians is 0.05233.
b) The exact value of cos-4 cannot be found.
c) The exact value of tan (-15) in radians is -sqrt(6) + sqrt(2).
(a) sin (3) :
Exact value of sin 3 in radians: We know that sin 3 is a value of a trigonometric function. We can find the exact value of sin 3 with the help of a trigonometric circle.
To calculate sin 3, we will divide the length of the opposite side of the triangle by the length of the hypotenuse. sin (3) = Opposite side / Hypotenuse = 0.05233
(b) cos-4
The value of cos-4 cannot be calculated without context. If -4 is the power of cosine function, then it can be calculated, and if -4 is the inverse of cosine function, then we need to be given an angle.
Hence, the exact value of cos-4 cannot be found with the given information.
(C) tan (- 15):
We know that: tan (- 15) = -tan 15
We can calculate tan 15 as we know that sin 15 = (sqrt(6) - sqrt(2))/4 and cos 15 = (sqrt(6) + sqrt(2))/4.
Then, tan 15 = sin 15/cos 15
Therefore, tan (- 15) = -tan 15 = -(sin 15/cos 15)
= -(sqrt(6) - sqrt(2))/(sqrt(6) + sqrt(2))
= -sqrt(6) + sqrt(2)
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A stone is thrown upward from ground level. The initial speed is 176 feet per second. How high will it go?
a. 484 feet
b) 510 feet
c. 500 feet
d., 492 feet
e/. 476 feet
The correct option is D. The stone will go 492 feet high.
The maximum height (h) that a stone thrown upward from ground level would go with an initial velocity (u) of 176 feet per second can be determined using the formula for projectile motion.
The formula for projectile motion
h = u²/2g
Where u is the initial velocity and g is the acceleration due to gravity, which is 32 feet per second squared.
Substituting the values
h = (176)²/(2 × 32) = 492 feet
Therefore, the stone will go 492 feet high. Hence, option D is correct.
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Please answer everything! thank you!
Probability S# 19xbo sluboM alomoss 7. A recent study of USF students found that 30 percent walk to class, 20 percent bike, and 12 percent do both. What is the percent of USF students who walk or bike
The percent of USF students who walk or bike is 38%.
Given that Percent of students who walk to class is 30%
Percent of students who bike to class = 20%
Percent of students who do both (walk and bike) = 12%
To calculate the percent of students who walk or bike, we can use the principle of inclusion-exclusion.
We add the percentages of those who walk and bike and then subtract the percentage of those who do both.
Percent of students who walk or bike = Percent who walk + Percent who bike - Percent who do both
Percent of students who walk or bike = 30% + 20% - 12%
Percent of students who walk or bike = 50% - 12%
Percent of students who walk or bike = 38%
Therefore, the percent of USF students who walk or bike is 38%.
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which event most contributed to the changing troop levels shown in this graph? The Twenty-Sixth Amendment lowered the draft age to 18 from 21.
U.S. and North Vietnamese ships exchanged fire in the Gulf of Tonkin.
Congress expanded presidential powers to wage war under the War Powers Act.
Communist troops launched a series of attacks during the Tet Offensive.
The event that most contributed to the changing troop levels shown in the graph is when Communist troops launched a series of attacks during the Tet Offensive.
The Communist troops launched a series of attacks during the Tet Offensive to try to undermine American and South Vietnamese morale, cause a general uprising and seize control of the cities in South Vietnam.
However, this didn't go as planned, since the Communist troops suffered devastating losses on the battlefield.
The Tet Offensive, which was one of the most important turning points in the Vietnam War, led to changes in troop levels that are shown on the graph.
The Tet Offensive significantly increased troop levels because American forces had to respond with more soldiers and resources to defend against the attacks.
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The event which most contributed to the changing troop levels shown in the graph was the Communist troops launching a series of attacks during the Tet Offensive.
The Tet Offensive was a series of attacks on the cities and towns of South Vietnam by the People's Army of Vietnam (PAVN) (also known as the North Vietnamese Army or NVA) and the National Liberation Front of South Vietnam (NLF), commonly known as the Viet Cong.
The Tet Offensive began in the early hours of 30th January 1968, during the Vietnam War. This event had a significant impact on public opinion and led to the escalation of the war.The graph in question, which depicts the troop levels, demonstrates that there was a considerable rise in US troop numbers during the years leading up to the Tet Offensive.
Following this event, troop numbers rose even higher before declining in the years that followed.
Therefore, the Communist troops launching a series of attacks during the Tet Offensive contributed most to the changing troop levels shown in the graph.
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find two power series solutions of the given differential equation about the ordinary point x=0: y′′ x2y′ xy=0.
The two power series solutions of the given differential equation about the ordinary point x=0 are [tex]y1(x) = ∑_(n=0)^∞▒〖(-1)^n x^(2n) 〗 and y2(x) = ∑_(n=0)^∞▒〖(-1)^n x^(2n+1) 〗.[/tex]
The given differential equation is [tex]y′′ x²y′ xy = 0[/tex].
We must find two power series solutions of the given differential equation about the ordinary point x=0.
The power series solution of the differential equation is given by
[tex]y (x) = ∑_(n=0)^∞▒〖a_n x^n 〗[/tex]
Differentiating the equation w.r.t. x, we get
[tex]y′(x) = ∑_(n=1)^∞▒〖a_n n x^(n-1) 〗[/tex]
Differentiating again w.r.t. x, we get
[tex]y′′(x) = ∑_(n=2)^∞▒〖a_n n (n-1) x^(n-2) 〗[/tex]
Substitute the above expressions of y(x), y′(x), and y′′(x) in the differential equation:
[tex]y′′ x²y′ xy = ∑_(n=2)^∞▒〖a_n n (n-1) x^(n-2) 〗x^2[∑_(n=1)^∞▒〖a_n n x^(n-1) 〗]x[∑_(n=0)^∞▒〖a_n x^n 〗] = 0[/tex]
We can simplify the above expression to get:
[tex]∑_(n=2)^∞▒〖a_n n (n-1) a_(n-1) x^(n-1) 〗+ ∑_(n=1)^∞▒〖a_n x^n+1[/tex]
[tex]∑_(n=0)^∞▒〖a_n x^n 〗〗 = 0n = 0: a_0 x^2 a_0 = 0a_0 = 0n = 1: a_1[/tex]
[tex]x^2 a_0 + a_1 x^2 a_1 x = 0a_1 = 0 or a_1 = -1n ≥ 2: a_n x^2 a_(n-1) n(n-1) + a_(n-2) x^2 a_n = 0a_n = (-1)^n x^2 (a_(n-2))/n(n-1)[/tex]
Therefore, the two power series solutions of the given differential equation about the ordinary point x=0 are:
y1(x) = a_0 + a_1 x + (-1)^2 x^2(a_0)/2! + (-1)^3 x^3(a_1)/3! + ……= ∑_(n=0)^∞▒〖(-1)^n x^(2n) 〗y2(x) = a_0 + a_1 x + (-1)^3 x^3(a_0)/2! + (-1)^4 x^4(a_1)/4! + ……= ∑_(n=0)^∞▒〖(-1)^n x^(2n+1) 〗
The two power series solutions of the given differential equation about the ordinary point x=0 are
[tex]y1(x) = ∑_(n=0)^∞▒〖(-1)^n x^(2n) 〗 and y2(x) = ∑_(n=0)^∞▒〖(-1)^n x^(2n+1) 〗.[/tex]
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HW 3: Problem 8 Previous Problem List Next (1 point) Find the value of the standard normal random variable z, called Zo such that: (a) P(zzo) 0.7196 Zo = (b) P(-20 ≤z≤ 20) = = 0.4024 Zo = (c) P(-2
The standard normal random variable, denoted as z, represents a normally distributed variable with a mean of 0 and a standard deviation of 1. To calculate the probabilities given in your question, we use the standard normal table (also known as the z-table).
(a) P(Z > 0.70) = 0.7196
This probability represents the area to the right of z = 0.70 under the standard normal curve. By looking up the value 0.70 in the z-table, we find that the corresponding area is approximately 0.7580. Therefore, the probability P(Z > 0.70) is approximately 0.7580.
(b) P(-2 ≤ Z ≤ 2) = 0.4024
This probability represents the area between z = -2 and z = 2 under the standard normal curve. By looking up the values -2 and 2 in the z-table, we find that the corresponding areas are approximately 0.0228 and 0.9772, respectively. Therefore, the probability P(-2 ≤ Z ≤ 2) is approximately 0.9772 - 0.0228 = 0.9544.
(c) P(-2 < Z < 2) = 0.9544
This probability represents the area between z = -2 and z = 2 under the standard normal curve, excluding the endpoints. By subtracting the areas of the tails (0.0228 and 0.0228) from the probability calculated in part (b), we get 0.9544.
Note: It seems there might be a typographical error in part (b) of your question where you mentioned P(-20 ≤ z ≤ 20) = 0.4024. The probability for such a wide range would be extremely close to 1, not 0.4024.
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how many integer solutions are there to 2x1 2x2 2x3 x4 x5 = 9 with xi ≥ 0?
To find the number of integer solutions to the equation 2x1 + 2x2 + 2x3 + x4 + x5 = 9 with xi ≥ 0, we can use a technique called "stars and bars" or "balls and urns."
In this technique, we imagine distributing 9 identical balls (representing the total value of 9) into 5 distinct urns (representing the variables x1, x2, x3, x4, and x5). We can visualize this by placing dividers (represented by bars) between the balls to separate them into groups.
For this problem, we have 9 balls and 4 dividers (bars) since there are 5 variables (x1, x2, x3, x4, x5). So, we need to arrange these 9 balls and 4 dividers.
The total number of arrangements is given by (9 + 4) choose 4, or (9 + 4)! / (4! * 9!).
Calculating this, we get:
(9 + 4)! / (4! * 9!) = 13! / (4! * 9!)
= (13 * 12 * 11 * 10) / (4 * 3 * 2 * 1)
= 13 * 11 * 5
= 715
Therefore, there are 715 integer solutions to the equation 2x1 + 2x2 + 2x3 + x4 + x5 = 9 with xi ≥ 0.
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although, in general, you cannot know the sampling distribution of the sample mean exactly, by what distribution can you often approximate it?
The distribution that is often used to approximate the sampling distribution of the sample mean is the normal distribution. The central limit theorem states that the distribution of sample means taken from a population with a mean and standard deviation will be normally distributed if the sample size is sufficiently large.
This theorem is very important in statistics since it justifies the use of the normal distribution to approximate the sampling distribution of the sample mean. A sampling distribution refers to a probability distribution that shows the means of all possible samples of a particular size taken from a population. The concept of a sampling distribution is essential since it allows us to make conclusions about a population using the information obtained from a sample. Even though the sampling distribution of the sample mean cannot be known precisely in general, it can be approximated by a normal distribution. The normal distribution is an important probability distribution in statistics since many variables, such as the sample mean, tend to follow a normal distribution. The normal distribution is a continuous probability distribution that is symmetrical and bell-shaped. It is characterized by two parameters, the mean and the standard deviation. The mean of a normal distribution is the center of the distribution, while the standard deviation is a measure of the dispersion of the data around the mean.
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A sports reporter suggests that baseball players must be, on average, older than football players, since football is a contact sport and players are more susceptible to concussions and serious injuries. One player was selected at random from each team in both a baseball league and a football league. The data are summarized in the accompanying table. Using the summary statistics, the sports reporter calculated that the 95% confidence interval for the mean difference between league baseball players and football players, HB-HF, was (-0.209,3.189). Summarize in context what the interval means. Click the icon to view the summary statistics for players from both sports. Select the correct answer below. OA. There is a 95% chance that the interval (-0.209,3.189) contains the difference between the sample means. OB. We are 95% confident that the mean age of baseball players is between 0.209 years younger and 3.189 years older than the mean age of football players. OC. We are confident that 95 out of every 100 random samples will yield groups where every baseball player is between 0.209 years younger and 3.189 years older than every football player. OD. The interval (-0.209.3.189) contains 95% of the difference between the sample means. - X Summary Statistics Baseball (B) 31 26.7 3.81 Print Football (F) 32 25.21 2.83 Done
Option OA is the correct answer.
The correct answer is: There is a 95% chance that the interval (-0.209,3.189) contains the difference between the sample means. A 95% confidence interval can be defined as the range of values inside which the actual population parameter is expected to lie, with 95% certainty, for a given sample size and level of significance. The 95% confidence interval given by the sports reporter for the mean difference between league baseball players and football players, HB-HF, was (-0.209,3.189). It suggests that the mean age of baseball players can be as low as 0.209 years below the mean age of football players or can be as high as 3.189 years above the mean age of football players. In summary, the interval (-0.209,3.189) has a 95% chance of containing the actual difference between the sample means.
The percentage (frequency) of acceptable confidence intervals that include the actual value of the unknown parameter is represented by the confidence level. In other words, a limitless number of independent samples are used to calculate the confidence intervals at the specified level of assurance. in order for the percentage of the range that contains the parameter's real value to be equal to the confidence level.
Most of the time, the confidence level is chosen before looking at the data. 95% confidence level is the standard level of assurance. However, additional confidence levels, such as the 90% and 99% confidence levels, are also applied.
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find the values of constants a, b, and c so that the graph of y= ax^3 bx^2 cx has a local maximum at x = -3, local minimum at x = -1, and inflection point at (-2, -2)
To find the values of constants a, b, and c that satisfy the given conditions, we need to consider the properties of the graph at the specified points.
Local Maximum at x = -3:
For a local maximum at x = -3, the derivative of the function must be zero at that point, and the second derivative must be negative. Let's differentiate the function with respect to x:
[tex]y = ax^3 + bx^2 + cx[/tex]
[tex]\frac{dy}{dx} = 3ax^2 + 2bx + c[/tex]
Setting x = -3 and equating the derivative to zero, we have:
[tex]0 = 3a(-3)^2 + 2b(-3) + c[/tex]
0 = 27a - 6b + c ----(1)
Local Minimum at x = -1:
For a local minimum at x = -1, the derivative of the function must be zero at that point, and the second derivative must be positive. Differentiating the function again:
[tex]\frac{{d^2y}}{{dx^2}} = 6ax + 2b[/tex]
Setting x = -1 and equating the derivative to zero, we have:
0 = 6a(-1) + 2b
0 = -6a + 2b ----(2)
Inflection Point at (-2, -2):
For an inflection point at (-2, -2), the second derivative must be zero at that point. Using the second derivative expression:
0 = 6a(-2) + 2b
0 = -12a + 2b ----(3)
We now have a system of equations (1), (2), and (3) with three unknowns (a, b, c). Solving this system will give us the values of the constants.
From equations (1) and (2), we can eliminate c:
27a - 6b + c = 0 ----(1)
-6a + 2b = 0 ----(2)
Adding equations (1) and (2), we get:
21a - 4b = 0
Solving this equation, we find [tex]a = (\frac{4}{21}) b[/tex].
Substituting this value of a into equation (2), we have:
[tex]-6\left(\frac{4}{21}\right)b + 2b = 0 \\\\\\-\frac{24}{21}b + \frac{42}{21}b = 0 \\\\\\\frac{18}{21}b = 0 \\\\\\b = 0[/tex]
Therefore, b = 0, and from equation (2), a = 0 as well.
Substituting these values into equation (3), we have:
0 = -12(0) + 2c
0 = 2c
c = 0
So, the values of constants a, b, and c are a = 0, b = 0, and c = 0.
Hence, the equation becomes y = 0, which means the function is a constant and does not have the specified properties.
Therefore, there are no values of constants a, b, and c that satisfy the given conditions.
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Find the missing value required to create a probability
distribution, then find the standard deviation for the given
probability distribution. Round to the nearest hundredth.
x / P(x)
0 / 0.15
1 / 2
To create a probability distribution, the missing probability value is 0.65. The standard deviation of the given probability distribution is approximately 0.60.
To find the missing value required to create a probability distribution, we need to determine the probability corresponding to the missing value.
x / P(x)
0 / 0.15
1 / 2
To create a probability distribution, the sum of all probabilities must equal 1. So, we can subtract the given probability from 1 to find the missing probability:
Missing probability = 1 - 0.15 - 0.2 = 0.65
Now, we have the complete probability distribution:
x / P(x)
0 / 0.15
1 / 0.2
2 / 0.65
To find the standard deviation of the given probability distribution, we can use the formula:
Standard deviation = sqrt(Σ((x - μ)^2 * P(x)))
where Σ represents the sum, x is the value, μ is the mean, and P(x) is the probability.
To find the mean (μ), we can calculate it as the weighted average of the values multiplied by their respective probabilities:
μ = (0 * 0.15) + (1 * 0.2) + (2 * 0.65) = 1.35
Now, we can calculate the standard deviation:
Standard deviation = sqrt(((0 - 1.35)^2 * 0.15) + ((1 - 1.35)^2 * 0.2) + ((2 - 1.35)^2 * 0.65))
Standard deviation ≈ sqrt(0.364)
Rounding to the nearest hundredth, the standard deviation is approximately 0.60.
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Given are the numbers of 30 test scores in a math class. 56, 69, 76, 84, 102, 69, 78, 92, 79, 80, 66, 78, 90, 99, 45, 76, 77, 80, 57, 57, 85, 88, 55, 86, 99, 97, 87, 75, 65, 70 a. Create a histogram to represent this data. (3points) b. Find the mean, median, mode and standard deviation. (3 points) c. Determine the five-number summary and draw a boxplot. (4 points)
a) Histogram is attached. b) Mean is 75.8, median is 78.5, mode is 57, Standard Deviation is 15.56. c) Five- line summary is Minimum: 45, Q1: 66, Median: 78.5, Q3: 87, Maximum: 102.
a. To create a histogram for the given data, we need to divide the range of scores into intervals (bins) and count the frequency of scores falling within each interval.
Scores Frequency
40-50 |
50-60 |||
60-70 ||||||||
70-80 |||||
80-90 |||||
90-100 ||||||
100-110 |
b) Calculate the mean:
To find the mean, we sum up all the test scores and divide by the total number of scores.
Mean = (56 + 69 + 76 + 84 + 102 + 69 + 78 + 92 + 79 + 80 + 66 + 78 + 90 + 99 + 45 + 76 + 77 + 80 + 57 + 57 + 85 + 88 + 55 + 86 + 99 + 97 + 87 + 75 + 65 + 70) / 30
Mean = 2274 / 30
Mean = 75.8
Therefore, the mean of the test scores is 75.8.
Calculate the median:
To find the median, we need to arrange the scores in ascending order and then determine the middle value.
Arranging the scores in ascending order: 45, 55, 56, 57, 57, 65, 66, 69, 69, 70, 75, 76, 76, 77, 78, 78, 79, 80, 80, 84, 85, 86, 87, 88, 90, 92, 97, 99, 99, 102
Since we have 30 scores, the median will be the average of the 15th and 16th values, which are 78 and 79.
Median = (78 + 79) / 2
Median = 78.5
Therefore, the median of the test scores is 78.5.
Calculate the mode:
The mode is the value(s) that appear(s) most frequently in the data set.
The mode of the given test scores is 57 because it appears twice, which is more frequently than any other value.
Therefore, the mode of the test scores is 57.
Calculate the standard deviation:
The standard deviation measures the spread of the data around the mean.
To calculate the standard deviation, we can use the following formula:
Standard Deviation = [tex]\sqrt{(xi-mean)^{2}/n }[/tex]
Where xi represents the sum, xi is each individual score, mean is the mean we calculated earlier, and n is the total number of scores.
Using this formula, we can calculate the standard deviation as follows:
Standard Deviation = [tex]\sqrt{((56-75.8)^{2}+(69-75.8)^{2}........+(70-75.8)^{2})/30}[/tex]
After calculating all the differences and summing them up, we divide by 30 and take the square root.
Standard Deviation ≈ 15.56
Therefore, the standard deviation of the test scores is approximately 15.56.
c) Calculate the five-number summary and draw a boxplot:
The five-number summary consists of the minimum, first quartile (Q1), median (Q2), third quartile (Q3), and maximum values of the data set.
Minimum: 45
Q1: 66
Median: 78.5
Q3: 87
Maximum: 102
To draw a boxplot, we use these five values. The box represents the interquartile range (Q3 - Q1), with a line inside representing the median. The whiskers extend to the minimum and maximum values.
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I am getting solution wrong and
the third attempt is the last attempt.
Problem #1: Solve the following initial value problem. x= -13y₁ + 4y2 1/₂ = -24y₁ + 7y₂ y₁ (0) = 5, y₂(0) = 2. Enter the functions y₁(x) and y₂(x) (in that order) into the answer box b
(2/3)e^(5x) + (4/3)e^(-4x) is correct for given initial value problem. x= -13y₁ + 4y2 1/₂ = -24y₁ + 7y₂ y₁ (0) = 5, y₂(0) = 2.
To solve the initial value problem
`x = -13y₁ + 4y₂ 1/2 = -24y₁ + 7y₂; y₁ (0) = 5, y₂(0) = 2`,
we first need to find the solution of the system of differential equations.
The solution is given by:
y₁(x) = (19/3)e^(5x) + (5/3)e^(-4x)y₂(x)
= (2/3)e^(5x) + (4/3)e^(-4x)
Therefore, the functions y₁(x) and y₂(x) are:
y₁(x) = (19/3)e^(5x) + (5/3)e^(-4x)y₂(x)
= (2/3)e^(5x) + (4/3)e^(-4x)
Note: As per the given information, the third attempt is the last attempt. If you have already used two attempts and the solution is incorrect, please make sure to check your calculations and try again before using the last attempt.
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A plane is headed due south at a speed of 298mph. A wind from direction 51 degress is blowing at 18 mph. Find the bearing pf the plane
To find the bearing of the plane, we will use the concept of vector addition. The process of adding two or more vectors together to form a larger vector is known as vector addition. If two vectors, A and B, are added, the resulting vector is the sum of the two vectors, and it is denoted by A + B.The plane is heading towards the south at a bearing of 24.68°.
The plane is flying towards south direction. So, we can assume that it has an initial vector, V, in the south direction with a magnitude of 298 mph. Also, the wind is blowing in the direction of 51° with a speed of 18 mph. So, the wind has a vector, W, in the direction of 51° with a magnitude of 18 mph.To find the bearing of the plane, we need to calculate the resultant vector of the plane and the wind.
Let's assume that the bearing of the plane is θ.Then, the angle between the resultant vector and the south direction will be (θ - 180°).Now, we can use the sine law to calculate the magnitude of the resultant vector.According to the sine law,`V / sin(180° - θ) = W / sin(51°)`
Simplifying this equation, we get:`V / sinθ = W / sin(51°)`Multiplying both sides by sinθ, we get:`V = W sinθ / sin(51°)`Now, we can calculate the magnitude of the resultant vector.`R = sqrt(V² + W² - 2VW cos(180° - 51°))`
Substituting the given values, we get:`R = sqrt((18sinθ / sin(51°))² + 18² - 2(18sinθ / sin(51°))18cos(129°))`Simplifying this equation, we get:`R = sqrt(324sin²θ / sin²51° + 324 + 648sinθ / sin51°)`
Now, we can differentiate this equation with respect to θ and equate it to zero to find the value of θ that minimizes R.`dR / dθ = (648sinθ / sin51°) / 2sqrt(324sin²θ / sin²51° + 324 + 648sinθ / sin51°) - (648sin²θ / sin²51°) / (2sin²51°sqrt(324sin²θ / sin²51° + 324 + 648sinθ / sin51°)) = 0`
Simplifying this equation, we get:`324sin²θ / sin⁴51° - 3sinθ / sin²51° + 1 = 0`Solving this equation, we get:`sinθ = 0.4078`Therefore, the bearing of the plane is:`θ = sin⁻¹(0.4078) = 24.68°`
So, the plane is heading towards the south at a bearing of 24.68°.
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each unit in the coordinate plane represents 1 foot. find the width of the sculpture at a height of 2 feet. (round your answer to three decimal places.)
The width of the sculpture at a height of 2 feet is 2 feet (rounded to three decimal places).
First, let's plot the points on the coordinate plane. We will have two points: Point A and Point B. The x-coordinate of both points will be the same as we are only interested in the width of the sculpture at a height of 2 feet. The y-coordinate of Point A will be 0 feet (as the sculpture is resting on the ground) and the y-coordinate of Point B will be 4 feet (as the height of the sculpture is 6 feet).Let the x-coordinate of Point A and Point B be x feet. So, the coordinates of Point A will be (x, 0) and the coordinates of Point B will be (x, 4). The length of the sculpture will be the distance between Point A and Point B, which is equal to 6 feet.Using the distance formula, the length of the sculpture (between Point A and Point B) can be expressed as:\[\sqrt{(x_2 - x_1)^2 + (y_2 - y_1)^2}\]Substituting the values of the coordinates of Point A and Point B in the distance formula, we get:\[\sqrt{(x - x)^2 + (4 - 0)^2}\]Simplifying, we get:\[\sqrt{0 + 16} = 4\]
Now, to find the width of the sculpture at a height of 2 feet, we need to find the distance between the points (x, 2) and (x, 4).Using the distance formula, we get:\[\sqrt{(x_2 - x_1)^2 + (y_2 - y_1)^2}\]Substituting the values of the coordinates of the points, we get:\[\sqrt{(x - x)^2 + (4 - 2)^2}\]Simplifying, we get:\[\sqrt{0 + 4} = 2\]Therefore, the width of the sculpture at a height of 2 feet is 2 feet (rounded to three decimal places).
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