how to do this question plz ​

The probability that at least 3 out of 9 randomly selected adult smartphone users use their smartphones in meetings or classes is approximately 0.8575.

To find the probability, we can use the binomial probability formula. Let's define a success as an adult using their smartphone in meetings or classes, with a probability of success (p) of 0.57.

We want to find the probability of getting at least 3 successes in 9 trials. This includes scenarios where we have 3, 4, 5, 6, 7, 8, or 9 successes. We can calculate the probability for each of these scenarios and sum them up.

Using the binomial probability formula:

P(X ≥ 3) = P(X = 3) + P(X = 4) + P(X = 5) + P(X = 6) + P(X = 7) + P(X = 8) + P(X = 9)

P(X = k) = C(n, k) * p^k * (1 - p)^(n - k)

where C(n, k) is the binomial coefficient, n is the number of trials, and k is the number of successes.

Calculating each term and summing them up:

P(X ≥ 3) = C(9, 3) * (0.57)^3 * (1 - 0.57)^(9 - 3) + C(9, 4) * (0.57)^4 * (1 - 0.57)^(9 - 4) + C(9, 5) * (0.57)^5 * (1 - 0.57)^(9 - 5) + C(9, 6) * (0.57)^6 * (1 - 0.57)^(9 - 6) + C(9, 7) * (0.57)^7 * (1 - 0.57)^(9 - 7) + C(9, 8) * (0.57)^8 * (1 - 0.57)^(9 - 8) + C(9, 9) * (0.57)^9 * (1 - 0.57)^(9 - 9)

Using the binomial coefficient values and simplifying:

P(X ≥ 3) ≈ 0.8575

The probability that at least 3 out of 9 randomly selected adult smartphone users use their smartphones in meetings or classes is approximately 0.8575. This means that in a random selection of 9 adult smartphone users, there is an 85.75% chance that at least 3 of them will use their smartphones in meetings or classes.

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Answer: about $4.67 a month

Explanation: If you figure out he makes a year her makes $56 and that's by multiplying 14 and 4, then you divide 56 by 12 and the you get a decimal so it'll round to $4.67

Answer:

Dried Fruit     Peanuts

     (oz)              (oz)

       4      7

      28      49

      52      91

Step-by-step explanation:

Answer:

ther is no k

Step-by-step explanation:

Answer:

Table 3

x | y

50 | 10

60 | 12

70 | 14

80 | 16

Step-by-step explanation:

x = time in minutes

y = distance travelled

Given that the bike travelled 7 miles after 35 minutes at a constant speed, the rate of change = [tex] \frac{7}{35} = \frac{1}{5} [/tex].

Thus, the table that represents the relationship between the time in minutes, x, and the distance the bike travles, y would have the same rate of change of ⅕.

Calculate the rate of change of each table using any two given pairs on the table:

Table 1: using (50, 10) and (55, 12)

Rate of change = [tex] \frac{y_2 - y_1}{x_2 - x_1} = \frac{12 - 10}{55 - 50} = \frac{2}{5} [/tex]

Table 2: using (60, 10) and (72, 12)

Rate of change = [tex] \frac{y_2 - y_1}{x_2 - x_1} = \frac{12 - 10}{72 - 60} = \frac{2}{12} = \frac{1}{6} [/tex]

Table 3: using (50, 10) and (60, 12)

Rate of change = [tex] \frac{y_2 - y_1}{x_2 - x_1} = \frac{12 - 10}{60 - 50} = \frac{2}{10} = \frac{1}{5} [/tex]

This table has the same rate of change.

Table 4: using (70, 10) and (84, 12)

Rate of change = [tex] \frac{y_2 - y_1}{x_2 - x_1} = \frac{12 - 10}{84 - 70} = \frac{2}{14} = \frac{1}{7} [/tex]

Table 3 represents the relationship between the time in minutes, x, and the distance the bike travles, y.

The Finance charge for Zeke's bobsled purchase is $197.50.

To find the finance charge for Zeke's bobsled purchase, we need to calculate the total amount he will pay in monthly payments over the 2.5-year period and subtract the initial purchase price.

Given:

Purchase price (bobsled) = $1250

Down payment = $450

Monthly payment = $48.25

Duration of payments = 2.5 years

Step 1: Calculate the total amount paid in monthly payments.

First, we need to determine the total number of monthly payments Zeke will make over 2.5 years. Since there are 12 months in a year, the total number of payments will be 2.5 years * 12 months/year = 30 payments.

Next, we calculate the total amount paid in monthly payments by multiplying the monthly payment by the number of payments:

Total monthly payments = Monthly payment * Number of payments

Total monthly payments = $48.25 * 30 = $1447.50

Step 2: Calculate the finance charge.

The finance charge is the difference between the total amount paid in monthly payments and the purchase price:

Finance charge = Total monthly payments - Purchase price

Finance charge = $1447.50 - $1250 = $197.50

Therefore, the finance charge for Zeke's bobsled purchase is $197.50.

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Answer:

6

Step-by-step explanation:

2(3) = 6

Answer:

6

Step-by-step explanation:

Replace the variable with the given value and evaluate.

[tex]2a\\\\a=3\\\\2(3)=\\\\\boxed{6}[/tex]

Hope this helps.

Answer:

Step-by-step explanation:

Given pairs of side lengths that represent two sides of a triangle, you want an inequality representing possible lengths for the third side.

The triangle inequality requires the sum of the two shortest sides be greater than the longest side. Translated to this problem, it means the third side must have a length between the difference and the sum of the other two sides. For third side x, we require ...

  13 -8 < x < 13 +8

  5 < x < 21

  23.6 -11.5 < x < 23.6 +11.5

  12.1 < x < 35.1

  22 -15 < x < 22 +15

  7 < x < 37

  13.2 -6.7 < x < 13.2 +6.7

  6.5 < x < 19.9

  44 -23 < x < 44 +23

  21 < x < 67

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Answer:

ok so if the girl added 13 gallons of gas 11 gallons were already there, if 14 gallons then 10 gallons were there, if 13,4 then 10,6 gallons were already there

Answer:

the answer is 75

Step-by-step explanation:

Answer:

The Correct Answer is (90,2)---C

Step-by-step explanation: The correct answer is C 90,2.

Answer:

27 is a composite number. 27 = 1 x 27, or 3 x 9. Factors of 27: 1, 3, 9, 27. Prime factorization: 27 = 3 x 3 x 3, which can also be written 27 = 3³.

this can also be written 27 = 3³

hope that helps :)

Answer:

y = 3

Step-by-step explanation:

We move all terms to the left:

26y-4-(68+2y)=0

We add all the numbers together, and all the variables

26y-(2y+68)-4=0

We get rid of parentheses

26y-2y-68-4=0

We add all the numbers together, and all the variables

24y-72=0

We move all terms containing y to the left, all other terms to the right

24y=72

y=72/24

y=3

Answer: the answer is

x=4

np;)

Step-by-step explanation:

Answer:

hope my answer is helpful to you

plz mark me as brainlist and also follow me

Answer: X = 2

Step-by-step explanation:

8.68x - 2.3x = 17 - 4.24

6.38x = 12.76

x = 2

Answer:

126  degrees

Step-by-step explanation:

3:7 means a total of 10; divide 180 by 10 to get 18; each 1 is 18; 18 * 7 is 126

Answer:

126°

Step-by-step explanation:

Step 1:

3 : 7       Ratio

Step 2:

3x + 7x = 180°        Substitution

Step 3:

10x = 180°      Combine Like Terms

Step 4:

x = 180° ÷ 10     Divide

Step 5:

x = 18°

Step 6:

18° × 7      Multiply

Answer:

126°

Hope This Helps :)

Answer:

10

Step-by-step explanation:

The slope of a graph is the same as the constant of proportionality of the equation.

slope= rise/run= 60/6=10

Answer:

You have the answer correct. (x+4, y-2)

Step-by-step explanation:

Point B' is 2 units down from Point B

Point B' is 4 units right from Point B

Answer:

1hour and 30 minutes each

Answer:

The incorrect statement is decreasing from (-∞, -1)

Step-by-step explanation:

Intercepts are where it touches the axis

The x intercepts are -2 and 1

Increasing is where it goes up

We are increasing from (-∞, -1) and (1,∞)

Decreasing is where it goes down

We are decreasing from ( -1,1)

The incorrect statement is decreasing from (-∞, -1)

Answer:

y=20

Step-by-step explanation:

Answer:

11.2

Step-by-step explanation:

Answer:

S

Step-by-step explanation:

S

Question: How does advertising expenditure (X_2) affect the quantity demanded (Q_t) based on the given demand function?

To investigate the relationship between advertising expenditure (X_2) and the quantity demanded (Q_t) using the given demand function, we need to understand the steps involved:

Begin by understanding the demand function: The demand function is expressed as Q_t = a_o + α_1 ln P_t + a_2 X_1 + E_Dt. It represents the quantity demanded (Q_t) as a function of market price (P_t), an exogenous variable X_1, and an error term E_Dt.

Introduce the new exogenous variable: In this case, we introduce advertising expenditure (X_2) as an additional exogenous variable. We want to investigate how this variable affects the quantity demanded.

Analyze the coefficient: The coefficient a_2 in the demand function represents the impact of X_1 on the quantity demanded. However, since we introduced a new exogenous variable X_2, we need to estimate the impact of X_2 on Q_t. By analyzing the coefficient a_2, we can determine the direction and magnitude of this relationship.

Conduct statistical analysis: To quantify the relationship between advertising expenditure (X_2) and the quantity demanded (Q_t), statistical analysis such as regression can be performed. By estimating the coefficients and conducting hypothesis tests, we can determine if X_2 has a statistically significant impact on Q_t.

Interpret the results: Based on the statistical analysis, we can interpret the results and draw conclusions regarding the relationship between advertising expenditure (X_2) and the quantity demanded (Q_t). The coefficient estimate and its statistical significance will provide insights into the direction and strength of this relationship.

In summary, by incorporating advertising expenditure (X_2) into the demand function and conducting statistical analysis, we can assess its impact on the quantity demanded (Q_t) and draw meaningful conclusions regarding the relationship between the two variables.

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The complete question may be like:

5 marks] Consider the following demand function for the quantity demanded of product Q_t as a function of its market price P_t:

Q_t = a_o + α_1 ln P_t + a_2 X_1 + E_Dt

where a_o, α_1, a_2, and E_Dt are parameters. X_1 represents an exogenous variable that affects the quantity demanded.

Now, let's imagine that you are a researcher studying the demand for a specific product, and you want to investigate the impact of advertising expenditure (represented by an exogenous variable, X_2) on the quantity demanded.

Formulate a question that addresses the relationship between advertising expenditure (X_2) and the quantity demanded (Q_t) based on the given demand function.

Answer:

ACD on edge2020

Step-by-step explanation:

The correct values function represented in the table is of y = acos(bx) are-

A function whose value increases algebraically as the independent variable increases algebraically across some range.

A function whose value declines as the independent variable rises over a specified range is referred to as a decreasing function.

Refer the attached table and graph.

Option (1) The function increases on the interval (π, 2π) is correct.

By graph, it is clear that the value of function is increasing between interval (π, 2π).

Option (2) The graph is compressed horizontally by a factor of One-half is incorrect.

Option (3) The frequency is StartFraction 1 Over 2 pi EndFraction is correct.

frequency = 1/time period

From the graph, time period in which function is repeating is 2π. thus frequency = 1/2π.

Option (4) The maximum value of the function is 6 is correct.

As shown in the graph, the range for the function goes up to 6.

Option (5) The period is π is incorrect.

The period for the the function is repeating is 2π not π.

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Approximately $334,728.87 should be set aside each year at the end of the period to accumulate $80,000 after 15 years with an interest rate of 10 percent.

To determine the amount that should be set aside each year to accumulate $80,000 after 15 years with an interest rate of 10 percent, we can use the Present Value-Future Value (PV-FV) tables.

First, let's find the Present Value Factor (PVF) for the given interest rate and time period. The PVF represents the value of $1 received or paid in the future, expressed in today's dollars.

From the PV-FV table for an interest rate of 10 percent and a time period of 15 years, we find the PVF to be 0.239.

Next, we divide the desired future value ($80,000) by the PVF to calculate the amount that should be set aside each year:

Amount to set aside each year = Future Value / PVF

= $80,000 / 0.239

≈ $334,728.87

Therefore, approximately $334,728.87 should be set aside each year at the end of the period to accumulate $80,000 after 15 years with an interest rate of 10 percent.

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Answer:

You would have 19 apples left

Step-by-step explanation:

32-1=31

31+5=36

36-17=19

Step-by-step explanation:

3x+7y-12=0

3x+7y=12

3x=12-7y

x=12-7y/3