Pls answer correctly fasttt!!

Answer:

The percent of change in Anna's working hours is 22%, indicating an increase.

Step-by-step explanation:

Step 1: Calculate the difference:

Difference = 36 hours - 28 hours

Difference = 8 hours

Step 2: Calculate the percent change:

Percent Change = (Difference / Original Value) * 100

Percent Change = (8 hours / 36 hours) * 100

Percent Change ≈ 22.22%

Therefore, the percent change in Anna's working hours is approximately 22.22%, representing an increase.

Answer:

14 students have to retake the test

Step-by-step explanation:

to calculate the mean mark as

sum of ( product of mark and frequency ) ÷ total

mean = [tex]\frac{14(2)+15(10)+16(2)+17(3)+18(13)}{30}[/tex]

        = [tex]\frac{28+150+32+51+234}{30}[/tex]

       = [tex]\frac{495}{30}[/tex]

      = 16.5

students who score less than 16.5 will retake the test , that is

2 scored 16 , 10 scored 15 , 2 scored 14

number who have to retake test = 2 + 10 + 2 = 14

Jasmine has 8 glasses of lemonade remaining in the pitcher.

Jasmine made a pitcher of lemonade, which contains 12 glasses of lemonade. She served 4 glasses of lemonade, and we need to determine how many more glasses she has left.

To solve this problem, we can subtract the number of glasses served from the total number of glasses in the pitcher:

12 (total glasses) - 4 (glasses served) = 8 (glasses remaining)

Therefore, Jasmine has 8 glasses of lemonade left in the pitcher after serving 4 glasses.

In terms of the equation, we have:

Total number of glasses - Number of glasses served = Number of glasses remaining

Or:

12 - 4 = 8

So, the correct equation and solution are:

12 - 4 = 8

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let's keep in mind that an inverse function has the same x,y pairs as the original function but flipped sideways, another mouthful way to put it is, the domain of the original function is the range of the inverse and the range of the original is the domain of the inverse.

well, since that's the case for g(x), Check the picture below.

now let's check for h⁻¹(x)

as you already know, to get the inverse of any expression we start off by doing a quick switcheroo on the variables and then solving for "y", let's do so.

[tex]\stackrel{h(x)}{h}~~ = ~~\cfrac{x-9}{7}\hspace{5em}\stackrel{\textit{quick switcheroo}}{x~~ = ~~\cfrac{h-9}{7}} \\\\\\ 7x=h-9\implies 7x+9=h ~~ = ~~ h^{-1}(x)[/tex]

now, what's [tex]\left( h^{-1}\circ h \right)(-5) ~~ \implies ~~ h^{-1}(h(-5))\textit{\LARGE ?}[/tex]

we know that h(x) is a one-to-one function and its inverse is a function, since that's the case h⁻¹(  h(x)  ) = x.

what the heck all that means?  well, it simply means that

[tex]\left( h^{-1}\circ h \right)(-5) ~~ \implies ~~ h^{-1}( ~~ h( ~~ \text{\LARGE -5} ~~ ) ~~ )~~ = ~~\text{\LARGE -5}[/tex]

The biconditional statement is: A rectangle is a parallelogram with four right angles if and only if a parallelogram has four right angles.

The term "if and only if" or biconditional statement refers to a compound statement composed of two conditional statements connected by a logical operator.

This definition is commonly utilized to describe the characteristics of a rectangle when it comes  to its correlation with a parallelogram. The opening section of the biconditional statement is comprised of a conditional statement indicating that a rectangle is defined as a parallelogram featuring four right angles.

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Write this definition as a biconditional statement.

A rectangle is a parallelogram with four right angles.

"X∧Y = ∧{X,Y}" indicates that the intersection of sets X and Y is equivalent to the intersection of all the sets contained in {X,Y}.

In the given question, "X∧Y = ∧{X,Y}" represents the intersection of sets X and Y.

The symbol "∧" denotes the intersection of two sets, which is the set of elements that are common to both sets. When we say "X∧Y," it means the intersection of sets X and Y, which consists of all the elements that belong to both X and Y.

On the other hand, "{X,Y}" represents a set containing the sets X and Y as its elements. So, "∧{X,Y}" refers to the intersection of all the sets in the set {X,Y}.

To clarify further, suppose X = {1, 2, 3} and Y = {2, 3, 4}. In this case, X∧Y would be {2, 3} because these elements are common to both sets X and Y. Similarly, if we consider the set {X,Y} = {X, Y}, then "∧{X,Y}" would mean the intersection of X and Y, which is again {2, 3}.

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[tex]5^(1/1)[/tex] is equivalent to 5, as no change is made to the value of 5.

The expression that represents 5 in rational exponent form is [tex]5^(1/1).[/tex]

In rational exponent form, we express a number or variable raised to a rational exponent, where the numerator represents the power and the denominator represents the root.

For the number 5, when we write it in rational exponent form as[tex]5^(1/1)[/tex], it means we are taking the 1st root (which is the same as saying no root at all) of 5 raised to the power of 1.

The numerator 1 represents the power, which indicates that we are not changing the value of 5, as any number raised to the power of 1 is itself. The denominator 1 represents the root, which is 1st root or no root at all, meaning we are not taking any root of 5.

It's worth noting that any number raised to the power of 1 is always equal to the number itself. So, [tex]5^(1/1)[/tex] simplifies to 5, representing 5 in rational exponent form.

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The surface integral in terms of ρ and θ ∫∫S.((6y - 5)e^(x^2))

To evaluate ∬s.curl F•nds using Stokes' Theorem, we first need to find the curl of the vector field F and then compute the surface integral over the given surface S.

Given vector field F = (6yz)i + (5x)j + (yz(e^(x^2)))k, let's find its curl:

∇ × F = ∂/∂x (yz(e^(x^2))) - ∂/∂y (5x) + ∂/∂z (6yz)

Taking the partial derivatives, we get:

∇ × F = (0 - 0) i + (0 - 0) j + (6y - 5)e^(x^2)

Now, let's parametrize the surface S, which is the portion of the paraboloid z = (1/4)x^2 + y^2 for 0 ≤ z ≤ 4. We can use cylindrical coordinates for this parametrization:

r(θ, ρ) = ρcos(θ)i + ρsin(θ)j + ((1/4)(ρcos(θ))^2 + (ρsin(θ))^2)k

where 0 ≤ θ ≤ 2π and 0 ≤ ρ ≤ 2.

Next, we need to find the normal vector n to the surface S. Since S is oriented upward, the normal vector points in the positive z-direction. We can normalize this vector to have unit length:

n = (∂r/∂θ) × (∂r/∂ρ)

Calculating the partial derivatives and taking the cross product, we have:

∂r/∂θ = -ρsin(θ)i + ρcos(θ)j

∂r/∂ρ = cos(θ)i + sin(θ)j + (1/2)(ρcos(θ))k

∂r/∂θ × ∂r/∂ρ = (-ρsin(θ)i + ρcos(θ)j) × (cos(θ)i + sin(θ)j + (1/2)(ρcos(θ))k)

Expanding the cross product, we get:

∂r/∂θ × ∂r/∂ρ = (ρcos(θ)(1/2)(ρcos(θ)) - (1/2)(ρcos(θ))(-ρsin(θ)))i

+ ((1/2)(ρcos(θ))sin(θ) - ρsin(θ)(1/2)(ρcos(θ)))j

+ (-ρsin(θ)cos(θ) + ρsin(θ)cos(θ))k

Simplifying further:

∂r/∂θ × ∂r/∂ρ = ρ^2cos(θ)i + ρ^2sin(θ)j

Now, we can calculate the surface integral using Stokes' Theorem:

∬s.curl F•nds = ∮c.F•dr

= ∫∫S.((∇ × F)•n) dS

Substituting the values we obtained earlier:

∫∫S.((∇ × F)•n) dS = ∫∫S.((6y - 5)e^(x^2))•(ρ^2cos(θ)i + ρ^2sin(θ)j) dS

We can now rewrite the surface integral in terms of ρ and θ:

∫∫S.((6y - 5)e^(x^2))

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Answer: -16

Step-by-step explanation:

The distance away from zero is 16 and -16 is negative + do u do rsm

P Q P V Q P ^ Q P -> Q -P -Q -P V -Q -P -> Q -P -> -Q P <-> Q

T T T T T F F F F F T    T

F T T F F T T T T T F    F

P F T F F T T T T T F     F

-P T T F F T T T T T F     F

-Q T T T T F T F F F T     T

-P V -Q T T F F T T T T T F

-P -> Q T T F F T T T T T F

-P -> -Q T T F F T T T T T F

P <-> Q T T T T F T T T T F

Here is a more detailed explanation of how I filled out the table:

P | Q : This column is simply the truth value of P and Q. If P and Q are both true, then the entry in this column is T. If P is true and Q is false, then the entry in this column is F. If P is false and Q is true, then the entry in this column is F. And if P and Q are both false, then the entry in this column is T.

P V Q : This column is the truth value of P or Q. If P is true, then the entry in this column is T. If Q is true, then the entry in this column is T. And if P and Q are both false, then the entry in this column is F.

P ^ Q : This column is the truth value of P and Q. If P and Q are both true, then the entry in this column is T. And if P and Q are both false, then the entry in this column is F.

P -> Q : This column is the truth value of P implies Q. If P is true and Q is false, then the entry in this column is F. And if P is false or Q is true, then the entry in this column is T.

-P : This column is the negation of P. If P is true, then the entry in this column is F. And if P is false, then the entry in this column is T.

-Q : This column is the negation of Q. If Q is true, then the entry in this column is F. And if Q is false, then the entry in this column is T.

-P V -Q : This column is the truth value of not P or not Q. If P and Q are both true, then the entry in this column is F. If P and Q are both false, then the entry in this column is T. And if P or Q is true, then the entry in this column is T.

-P -> Q : This column is the truth value of not P implies Q. If P is true and Q is false, then the entry in this column is T. And if P is false or Q is true, then the entry in this column is F.

-P -> -Q : This column is the truth value of not P implies not Q. If P and Q are both true, then the entry in this column is T. If P is false or Q is false, then the entry in this column is T. And if P is true and Q is true, then the entry in this column is F.

P <-> Q : This column is the truth value of P if and only if Q. If P and Q are both true or P and Q are both false, then the entry in this column is T. And if P and Q have different truth values, then the entry in this column is F.

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Answer:

$393,120

Step-by-step explanation:

To find the decrease in the house's value in dollars, we need to calculate 9% of the initial value:

Decrease in value = (Initial value) * (Percentage decrease) = $432,000 * 9%

Converting the percentage to a decimal:

Decrease in value = $432,000 * 0.09 = $38,880

The house's value decreased by $38,880.

Now, to find the current value of the house, we need to subtract the decrease in value from the initial value:

Current value = Initial value - Decrease in value = $432,000 - $38,880 = $393,120

The current value of the house is $393,120.

Hope this helps!

The expressions that are equivalent to 2c - 8. By applying algebraic properties and operations such as distribution, Simplification, addition, and subtraction its equivalence to the original expression.

To find expressions that are equivalent to 2c - 8, we can use the properties of algebraic operations to manipulate and simplify the expression. Here are a few examples:

1. 2(c - 4):

  By using the distributive property, we can distribute the 2 to both terms inside the parentheses:

  2c - 8.

  This expression is equivalent to 2c - 8 since it simplifies to the same value.

2. 2(c - 4) + 16:

  Adding 16 to the previous expression, we get:

  2c - 8 + 16.

  Combining like terms, we have:

  2c + 8.

  This expression is also equivalent to 2c - 8.

3. 4c - 16:

  By multiplying both terms in 2c - 8 by 2, we get:

  4c - 16.

  This expression is equivalent to 2c - 8 since it represents the same value.

4. 2(c - 3) - 2:

  By subtracting 2 from the previous expression, we have:

  2c - 8 - 2.

  Combining like terms, we get:

  2c - 10.

  This expression is equivalent to 2c - 8 as it simplifies to the same value.

These are just a few examples of expressions that are equivalent to 2c - 8. By applying algebraic properties and operations such as distribution, simplification, addition, and subtraction, we can manipulate the expression in various ways while maintaining its equivalence to the original expression.

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so we have a base, hmmm which is 21, now is a base so that's area, not length, so we're assuming is 21 meters² and it has a height of 12 meters.

Let's nevermind the 12 meters in height, we know the pool has a base of 21 m² and if it's filled up to 3 meters, the volume of that triangular prism is simply the product of the base and the height of 3 meters, so (21 m²)(3 m) = 63 m³.

Calculating the area of a road involves considering the road's shape and cross-sectional profile. There are two common methods for calculating the area:

Cross-Sectional Area Method: This method involves measuring the width of the road at regular intervals along its length and taking elevation measurements. By dividing the road into sections and multiplying the width by the corresponding elevation difference, you can calculate the area of each section and sum them up to obtain the total road area.

Digital Terrain Model (DTM) Method: This method uses advanced surveying techniques to obtain a digital terrain model of the road surface. By applying surface area algorithms to the DTM, you can calculate the surface area of the road, considering the elevation data and interpolating the area between points.

The chosen method depends on available data, accuracy requirements, and project needs. It is essential to refer to engineering standards and guidelines specific to your region or project for accurate and appropriate road area calculations.

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5) The measures of central tendency for the monthly rainfall (in inches) are as follows:

6) The measures of central tendency for the July 4th Temperatures (°F) are as follows:

7) The measures of central tendency for the Baby Sleep Log (in hours) are as follows:

8) The measures of central tendency for the Daily running log (in kilometers) are as follows:

9) The measures of central tendency for the Reading log (in pages) are as follows:

10) The measures of central tendency for the Monthly snowfall (in inches) are as follows:

The measures of central tendency are typical values or summary statistics of a data set.

The three main measures of central tendency are the mean (the average value), the median (the middle value), and the mode (the most occurring values).

5) Monthly Rainfall (in inches):

1, 0, 2, 0.5, 0.25, 3, 0.25

Arranged data: 0, 0.25, 0.25, 0.5, 1, 2, 3

Total value = 7 (0 + 0.25 + 0.25 + 0.5 + 1 + 2 + 3)

Number of items = 7

Mean = 1 inch (7 ÷ 7)

Median = 0.5 inches

Modes = 0.25 inches

6) July 4th Temperatures (°F):

89, 94, 96, 99, 96, 97, 95, 92

Arranged data: 89, 92, 94, 95, 96, 96, 97, 99

Total value = 758°F (89 + 92 + 94 + 95 + 96 + 96 + 97 + 99)

Number of items = 8

Mean = 94.75°F (758 ÷ 8)

Median = 95.5°F (95 + 96)

Modes = 96°F

7) Baby Sleep Log (in hours):

10, 8, 9, 8, 8.25, 9.25, 8.5

Arranged data: 8, 8, 8.25, 8.5, 9, 9.25, 10

Total value = 61 (8 + 8 + 8.25 + 8.5 + 9 + 9.25 + 10)

Number of items = 7

Mean = 8.7 hours (61  ÷ 7)

Median = 8.5 hours

Modes = 8 hours

8) Daily running log (in kilometers):

3.5, 0, 2.5, 5, 2.5, 3, 4.5

Arranged data: 0, 2.5, 2.5, 3, 3.5, 4.5, 5

Total value = 21 (0 + 2.5 + 2.5 + 3 + 3.5 + 4.5 + 5)

Number of items = 7

Mean = 3 km (21  ÷ 7)

Median = 3 km

Modes = 2.5 km

9) Reading log (in pages):

21, 42, 25, 45, 37, 34, 30

Arranged data: 21, 25, 30, 34, 37, 42, 45

Total value = 234 (21 + 25 + 30 + 34 + 37 + 42 + 45)

Number of items = 7

Mean = 33.4 pages (234 ÷ 7)

Median = 34 pages

Modes = None

10) Monthly snowfall (in inches):

0.5, 2, 5, 0.25, 1

Arranged data: 0.25, 0.5, 1, 2, 5

Total values = 8.75 inches(0.25 + 0.5 + 1 + 2 + 5)

Number of items = 5

Mean = 1.75 inches (8.75÷ 5)

Median = 1

Modes = None

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Both angle K and angle L must be acute angles, measuring less than 90 degrees, in order to satisfy the conditions of the given triangle.

In triangle JKL, if angle J is less than 90 degrees, then angle K and angle L are both acute angles.

An acute angle is defined as an angle that measures less than 90 degrees. Since angle J is given to be less than 90 degrees, it is an acute angle.

In a triangle, the sum of the interior angles is always 180 degrees. Therefore, if angle J is less than 90 degrees, the sum of angles K and L must be greater than 90 degrees in order to satisfy the condition that the angles of a triangle add up to 180 degrees.

Hence, both angle K and angle L must be acute angles, measuring less than 90 degrees, in order to satisfy the conditions of the given triangle.

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The translation pattern that took place is given as follows:

(x, y) -> (x + 2, y - 9).

The effect on the coordinates is given as follows:

The four translation rules are defined as follows:

Hence the composite translation rule from ABC to A'B'C' is given as follows:

(x, y) -> (x + 2, y - 9).

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The volume of the composite figure in this problem is given as follows:

76 ft³.

The volume of a rectangular prism, with dimensions defined as length, width and height, is given by the multiplication of these three defined dimensions, according to the equation presented as follows:

Volume = length x width x height.

The figure in this problem is composed by two prisms, with dimensions given as follows:

Hence the volume is given as follows:

2 x 6 x 3 + 2 x 4 x 5 = 76 ft³.

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The first quartile being 39 years old indicates a relatively younger age profile among the employees at CCNHS – Main Campus.

The first quartile (Q1) of the ages of the 256 employees of CCNHS – Main Campus being 39 years old implies that 25% of the employees have an age equal to or less than 39 years old.

To solve the problem, we need to understand the concept of quartiles. In statistics, quartiles divide a data set into four equal parts. The first quartile represents the point below which 25% of the data falls.

In this case, since the first quartile is 39 years old, it means that approximately one-fourth of the employees at CCNHS – Main Campus are 39 years old or younger.

This information provides insight into the age distribution of the employees. It suggests that there is a significant proportion of younger employees within the institution. Understanding the age demographics can be important for various purposes such as human resources planning, identifying generational differences, and designing age-appropriate policies or programs.

Overall, the first quartile being 39 years old indicates a relatively younger age profile among the employees at CCNHS – Main Campus.

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• To find the zero you have to set each factor equal to zero and solving for the variable...

(i) x – 3

setting factor equal to zero,

→ x – 3 = 0

→ x = 0 + 3

→ x = 3

(ii) 2x + 1

setting factor equal to zero,

→ 2x + 1 = 0

→ 2x = –1

→ x = -½

(iii) 5x – 10

setting factor equal to zero,

→ 5x - 10 = 0

→ 5x = 10

→ x = 10/5

→ x = 2

(iv) x - √5

setting factor equal to zero,

→ x - √5 = 0

→ x = √5

The zeros of each factor are given as follows:

The factor theorem states that a function is defined as a product of it's linear factors, if x = a is a root, then x - a is a linear factor of the function.

On the other side, if x - a is a linear factor of the function, x = a is a zero of the function.

Hence the zeros of each linear factor are given as follows:

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The measures of central tendency of the dataset, and the measurements in the dataset indicates;

(a) Mode

(b) Mean

(c) Mean, Median

(d) Roughly symmetrical

Measures of central tendency are descriptive statistical values that represent the typical value or centerpoint of a data set.

(a) The mean of a data set always has only one value. The mode of the dataset are 11 and 14. Therefore, the measure of central tendency that takes more than one value is the mode. The correct option is therefore;

Mode

(b) The mode will remain the same. The middle value or median will remain the same. The mean, which i the average value will increase. The correct option for measure of central tendency that will be affected by the change is therefore the mean.

Mean

(c) The smallest measurement which is 1, if removed, the mean will change and the median will change from 11 to (10 + 11)/2 = 10.5. The correct options for the measures of central tendency that will change are therefore;

Mean

Median

(d) The distribution of the original dataset can be presented as shown in the histogram, which is symmetrical about the class with one of the modes, indicating that the original data is roughly symmetrical about the class with the mode 11. The correct option is therefore;

Roughly symmetrical

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Answer:

$61.29 per day.

Step-by-step explanation:

Checking account balance on February 1st: $443

Checking account balance on February 7th: $872

Difference in balances: $872 - $443 = $429

Number of days between February 1st and February 7th: 7 days

Rate of change = Difference in balances / Number of days

Rate of change = $429 / 7 days

To find the rate of change per day, divide the difference in balances by the number of days:

Rate of change = $429 / 7 days ≈ $61.29 per day

Therefore, the rate of change in your checking account balance during that period was approximately $61.29 per day.

The system of equations that represents this is:

x + y = 144

x*23 + y*90 = 10347

Solving it, we conclude that they sold 39 of the Basic ones and 105 of the Super ones.

To do this, first we need to define the variables we will be using. Let's define:

x = number of basic graphers sold.

y = number of SuperGraphers sold.

They sold a total of 144 items, so x + y = 144

And they earned a total of $10347, then we can write:

x*23 + y*90 = 10347

Then the system of equations that represents this is:

x + y = 144

x*23 + y*90 = 10347

The graph of this system is on the image below, there we can see that the solution is (39, 105).

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Answer:

Step-by-step explanation:

cos θ=0.58

[tex]\theta=cos^{-1} (0.58) \approx 54.55^\circ,(360-54.55)^\circ\\\theta=305.45^\circ[/tex]

∵ θ lies between 180° and 360°

Answer: 4032 cm^2.

Step-by-step explanation: The equation to find the surface area of a rectangular prism is SA=2(wl+hl+hw). Substitute the given values into the equation. SA=2(12x12+15x12+15x12). Simplify inside the parentheses. SA=2(144+180+180). SA=2(504). SA=1008 cm^2. This is the surface area for 1 box. Multiply the surface area by 4 to get the total surface area of 4 congruent boxes. 1008x4=4032 cm^2.

Statement 1, 2 and 3 are correct about using the distributive property.

Expanding is the same as using the distributive property. Factoring means going from ab + ac to a(b + c).Factoring can only be done when an expression has two terms.

Statement 1: Expanding is the same as using the distributive property. The distributive property states that a(b + c) = ab + ac. When we expand an expression, we are multiplying everything out. So, expanding an expression is the same as using the distributive property. Therefore, this statement is correct.

Statement 2: Factoring means going from ab + ac to a(b + c).When we factor an expression, we are essentially undoing the distributive property. In other words, we are going from a common factor in the two terms to a product. This is exactly what happens when we factor ab + ac to a(b + c). Therefore, this statement is correct.

Statement 3: Factoring can only be done when an expression has two terms. Factoring is the process of breaking down an expression into simpler factors. However, in order to do that, the expression needs to have two or more terms. If the expression only has one term, then we cannot factor it. Therefore, this statement is correct.

Statement 4: Factoring can only be done when an expression has plus signs. This statement is incorrect. Factoring can be done when an expression has either plus signs or minus signs. For example, we can factor x² - 4 to (x + 2)(x - 2). Therefore, this statement is incorrect.

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The Width of Joseph's sandbox is 15.2 meters.

The width of Joseph's sandbox, we need to use the formula for the perimeter of a rectangle:

Perimeter = 2 * (Length + Width)

Given that the perimeter is 400.8 meters and the length is 185.2 meters, we can substitute these values into the formula:

400.8 = 2 * (185.2 + Width)

To solve for the width, we can start by simplifying the equation:

400.8 = 370.4 + 2 * Width

Next, let's isolate the term with Width by subtracting 370.4 from both sides:

400.8 - 370.4 = 2 * Width

30.4 = 2 * Width

Finally, we can divide both sides by 2 to solve for Width:

Width = 30.4 / 2

Width = 15.2 meters

Therefore, the width of Joseph's sandbox is 15.2 meters.

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The amount of money he will have after eight years of savings would be = 15,600.

To calculate the total amount of money the skateboarder will have after the number of giveyears, the formula that should be used would be given below as follows:

Simple interest = Principal×time ×rate /100

Where:

principal = 10,000

Time = 8 years

Rate = 7%

Simple interest = 10,000×8×7/100

= 560000/100

= 5600

The total amount of money the skateboarder will have will be = 10,000+5600 = 15,600

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Covariance between two variables x and y is -9/56 (= -0.160). Option C

Covariance between two variables is a measure of how much the variables change together. It's calculated with the formula:

Cov(X, Y) = E[XY] - E[X]E[Y]

Where:

E[XY] is the expected value of the product of X and Y.

E[X] is the expected value of X.

E[Y] is the expected value of Y.

First, we need to calculate E[X], E[Y], and E[XY].

E[X] = ∑ x × g(x) for all x

= 0×(5/14) + 1×(15/28) + 2×(3/28)

= 15/28 + 6/28 = 21/28 = 0.75

E[Y] = ∑ y × h(y) for all y

= 0×(15/28) + 1×(3/7) + 2×(1/28)

=0.5

E[XY] = ∑∑ xyf(x, y) for all (x, y)

= 00(3/28) + 01(3/14) + 02(1/28) + 10(9/28) + 11(3/14) + 12(0) + 20(3/28) + 21(0) + 22(0)

= 0.2143

Now we can substitute these values into the formula for Cov(X, Y):

Cov(X, Y) = E[XY] - E[X]E[Y]

= 0.2143 - (0.75)×(0.5)

= -0.1607

Find more exercises on Covariance;

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