IQ scores are normally distributed with a mean of 100 and a
standard deviation of 15.
Draw a rough sketch of what this would look like on a normal distribution curve.

Use the empirical rule to show that 95% of IQ scores are between 70 and 130.
3. What interval contains 99.7% of IQ scores?

The mean of this binomial distribution is 12.0, rounded to the nearest tenth

The mean of a binomial distribution represents the average number of successes in a fixed number of independent trials, where each trial has a constant probability of success. It is calculated by multiplying the number of trials (n) by the probability of success on each trial (p).

In this case, we are given the values n = 20 and p = 0.6. So, the mean can be calculated as:

μ = np = 20 x 0.6 = 12

This means that, on average, we would expect 12 successes out of 20 independent trials, each with a probability of success of 0.6.

Therefore, the mean of this binomial distribution is 12.0, rounded to the nearest tenth.

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The correct answer is S = {A, D, D, I, T, I, O, N}.

What is probability?

Probability is a measure of the likelihood or chance of an event occurring. It is a number between 0 and 1, with 0 representing an impossible event and 1 representing a certain event. The probability of an event is calculated by dividing the number of ways the event can occur by the total number of possible outcomes.

The sample space is the set of all possible outcomes of an experiment or event.

In this case, the experiment is choosing one card from a set of eight labeled cards.

The sample space for this experiment is the set of all possible cards that can be chosen.

In the given problem, there are eight cards labeled A, D, D, I, T, I, O, N.

The sample space is the set of all possible cards that can be chosen, which is {A, D, D, I, T, I, O, N}.

This is because each card is distinct and can be chosen independently of the others.

Therefore, the correct answer is S = {A, D, D, I, T, I, O, N}.

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Answer: A( A,D, D,I, I,N,O,T)

Step-by-step explanation:

Order does not matter!!

The value of 'x' that represents in the figure given in which WZ is tangent to the circle Y is 26 units, found using pythagoras-theorem.

What is pythagoras-theorem?

The link between the three sides of a right-angled triangle is shown by the Pythagoras theorem, often known as the Pythagorean theorem. The square of a triangle's hypotenuse is equal to the sum of its other two sides' squares, according to the Pythagorean theorem. According to the Pythagoras theorem, the hypotenuse's square is equal to the sum of the squares of the other two sides if the triangle has a right angle.

Given that in circle Y,

WZ = tangent to the circle = x - 2

YZ= Perpendicular from centre to tangent=10 units

WY=line joining centre & point on tangent =x units

Consider ΔWYZ,

∠Z=90°

[tex]WY^{2} =WZ^{2} +YZ^{2}[/tex]

[tex]x^{2} =(x-2)^{2} +(10)^{2}[/tex]

[tex]x^{2} =x^{2} +4 -4x + 100[/tex]

[tex]x^{2} -x^{2} + 4x = 4 + 100[/tex]

[tex]4x = 104[/tex]

x =104 ÷ 4

x =26 units

WY=x =26 units

WZ=x-2=24 units.

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The interval estimate that will estimate the true average time that people spend brushing their teeth is given by 42.3 ± 1.35

42.3 is the point estimate of the population mean, and 1.35 is the margin of error. The lower limit of the interval is given by subtracting the margin of error from the point estimate:

42.3 - 1.35 = 40.95

The upper limit of the interval is given by adding the margin of error to the point estimate:

42.3 + 1.35 = 43.65

Therefore, the 95% confidence interval estimate for the true average time that people spend brushing their teeth is (40.95, 43.65) seconds. This means that we are 95% confident that the true average time that people spend brushing their teeth falls within this interval.

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Answer:

  (b)  (g∘f)(x) = (x +1)²

Step-by-step explanation:

Given that f(x) = x +1 and g(x) = x², you want to know the meaning of (g∘f)(x).

The ring operator (∘) is used to form a composition of functions. The composition is evaluated right to left:

  (g∘f)(x) = g(f(x))

That is, f(x) is evaluated first, and the result is used as the argument for function g.

  g(f(x)) = g(x +1) = (x +1)²

Then ...

  (g∘f)(x) = (x +1)²

a) The expected number of times that you will roll a ‘7’ is 833.33.

b) The approximate probability that you will roll a ‘7’ no more than 850 times is 70%.

c) The value of the integer is 907.

(a) The number of ways to get a sum of 7 when rolling two dice is 6 (1+6, 2+5, 3+4, 4+3, 5+2, 6+1). Since there are 36 possible outcomes when rolling two dice, the probability of getting a sum of 7 on any given roll is 6/36 = 1/6. Therefore, the expected number of times that you will roll a 7 in 5000 rolls is (1/6)*5000 = 833.33 (rounded to two decimal places).

(b) We can approximate the number of times that you will roll a 7 using a normal distribution with mean 833.33 and standard deviation sqrt(5000*(1/6)*(5/6)) ≈ 31.49 (using the formula for the standard deviation of the binomial distribution). Then, we want to find the probability that the number of 7s rolled is less than or equal to 850, which is equivalent to finding the probability that a standard normal distribution is less than or equal to (850 - 833.33)/31.49 ≈ 0.53. Using a standard normal distribution table or calculator, we find that this probability is about 70%. Therefore, the approximate probability that you will roll a 7 no more than 850 times is 70% (rounded to the nearest percent).

(c) We want to find the x such that P(number of 7s > x) ≈ 1/100. Using the same normal approximation as in part (b), we can find the z-score corresponding to a probability of 0.99 (since we want the area to the right of the z-score to be 0.01): z ≈ 2.33. Then, we solve for x in the equation (x - 833.33)/31.49 = 2.33, which gives x ≈ 907 (rounded to the nearest integer). Therefore, the integer x such that the probability of rolling a 7 more than x times is about 1 in 100 is 907.

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The Ball bearings produced using this manufacturing process have an average diameter of 3.5 mm which is calculated using the mean formula.

Since the ball orientation are equally dispersed between 2.5 and 4.5 mm, the normal breadth can be decided to utilize the equation:

mean = (a + b) / 2

where a is the lower dividing constraint (2.5 mm) and b is the upper dividing restrain (4.5 mm).

 Substitute the obtained value in the mean formula,

mean = (2.5 + 4.5) / 2

= 3.5

therefore, Ball bearings produced using this manufacturing process have an average diameter of 3.5 mm. 

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The minimum raw score needed for a student to receive a grade of A is 8.74

The first step is to find the cutoff score that corresponds to the top 25% of the distribution.

To do this, we need to find the z-score that corresponds to the 75th percentile (since we want the top 25%, which is the same as the 75th percentile and above).

Using a standard normal distribution table or calculator, we can find that the z-score corresponding to the 75th percentile is approximately 0.67.

Next, we can use the formula: z = (x - μ) / σ

where z is the z-score, x is the raw score, μ is the mean, and σ is the standard deviation.

Plugging in the values we know: 0.67 = (x - 7) / 2.6

Solving for x, we get x = 8.74

Therefore, the minimum raw score needed for a student to receive a grade of A is 8.74.

So, the answer is (b) 8.74.

To determine the minimum raw score needed for a student to receive an A, we need to find the cutoff point for the top 25 percent of the distribution.

Given the mean=7 and standard deviation (s)=2.6, we can use the z-score formula to find the corresponding raw score.

A z-score of 0.674 corresponds to the top 25 percent of a distribution.

Using the formula, X = mean + (z-score × standard deviation), we can calculate the minimum raw score:

X = 7 + (0.674 × 2.6) ≈ 8.74

So, the minimum raw score needed for a student to receive a grade of A is 8.74 (option b).

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As the sample size (n) increases, the margin of error (MOE) in a confidence interval decreases, keeping everything else the same. Therefore, the correct answer is MOE decreases as n increases.

As the sample size increases, the margin of error (MOE) in a confidence interval decreases. This means that answer choice B, "MOE decreases as n increases," is the correct answer. When the sample size is larger, the sample is more representative of the population, and therefore there is less uncertainty in the estimate of the population parameter. This leads to a smaller margin of error.

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The general solution for the given differential equation is y = -1/(x + C) + x - 1.

To find the general solution for the given differential equation dy/dx = 1 + (y - x + 1)², we will use the linear substitution method. Let's define a new variable v = y - x + 1.

Then, we can find the derivative of v with respect to x.
Define the substitution variable.
v = y - x + 1
Differentiate v with respect to x.
dv/dx = dy/dx - 1
Replace dy/dx in the original equation with dv/dx + 1.
dv/dx + 1 = 1 + (y - x + 1)²
dv/dx = (y - x + 1)² = v²
Separate the variables and integrate both sides.
∫(1/v²) dv = ∫dx
Evaluate the integrals.
-1/v = x + C
Solve for v.
v = -1/(x + C)
Replace v with the original substitution variable (y - x + 1).
y - x + 1 = -1/(x + C)
Solve for y to obtain the general solution.
y = -1/(x + C) + x - 1.

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First, let's find f(6) and f'(6).

1. f(6) = 2000 * e^(-0.22 * 6)
f(6) ≈ 669.13

2. f'(p) = -0.22 * 2000 * e^(-0.22 * p)
f'(6) ≈ -146.98

In economic terms:

f(6) = 669.13 represents the quantity of the product demanded when the price is $6. In other words, at a price of $6 per unit, consumers would purchase approximately 669 units of the product.

f'(6) = -146.98 represents the rate at which the quantity demanded changes with respect to the price at p = 6. A negative value means that as the price increases, the quantity demanded decreases, which is typical behavior for a demand curve. In this case, for every $1 increase in price, the quantity demanded will decrease by approximately 147 units, when the price is $6.

The demand curve shows the relationship between the price of a product and the quantity demanded by consumers. The function f(p) and its derivative f'(p) provide valuable information for understanding how changes in price can impact the demand for a product.

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The point (ab) for which the volume of the solid between the plane and R is ∞

To find the volume of this solid, we need to integrate the height of the prism over the area of the base. Since the base is a rectangle, this can be done using a double integral. Let h(x, y) be the height of the prism at the point (x, y) in the rectangle. Then the volume of the solid is given by:

V = ∬[R] h(x, y) dA

where [R] is the region corresponding to the rectangle in the xy-plane.

We can find the height of the prism at any point (x, y) by considering the equation of the plane. The equation 3x + 7y + 242 = 0 can be rewritten as:

z = -(3/7)x - 242/7

So the height of the prism at the point (x, y) is given by:

h(x, y) = -(3/7)x - (7/3)y - 242/7

Now we can set up the double integral to find the volume of the solid:

V = ∫∫ (-(3/7)x - (7/3)y - 242/7) dxdy

To see why this is true, imagine sliding the plane up and down while keeping it parallel to itself. As you do this, the solid between the plane and the rectangle will change shape, but the volume of the solid will remain the same.

At some point, the plane will be tangent to the rectangle at one of its vertices, and this will be the point where the volume of the solid is maximized.

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Answer: The average amount of pocket change per person is $2.06.

Step-by-step explanation:

To find the average amount of pocket change per person, we need to first add up all the amounts and then divide by the number of people (which is 7 in this case).

Adding up the amounts: $0.00 + $1.25 + $0.02 + $2.00 + $10.75 + $0.40 + $0.00 = $14.42

Dividing by the number of people: $14.42 ÷ 7 = $2.06 So the average amount of pocket change per person is $2.06.

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Step-by-step explanation:

The interior angles of a   n-gon   sum to  ( n-2) * 180

   so for this 4-gon

All of the angles have to sum to 360

17x+8     + 66     + 110    + 74 = 360

17x + 258 = 360

x = 6

Answer:

Step-by-step explanation:

16

The linear equation that describes the book value of the equipment each year is:
Book Value = Purchase Value - (Purchase Value - Salvage Value) / Useful Life * Years
Therefore, the equation becomes:
Book Value = $12,000 - ($12,000 - $2,000) / 8 * Years
Book Value = $12,000 - $1,000 * Years
This equation shows that the book value of the equipment decreases by $1,000 each year.

Let's write a linear equation to describe the book value of the equipment each year, considering the terms "purchased," "value," and "equation."

The college purchased the equipment for $12,000, and it has a salvage value of $2,000 after 8 years. We need to find how much the value of the equipment depreciates each year.

Step 1: Calculate the total depreciation over the 8 years.
Total depreciation = Initial value - Salvage value
Total depreciation = $12,000 - $2,000
Total depreciation = $10,000

Step 2: Calculate the annual depreciation.
Annual depreciation = Total depreciation / Useful life
Annual depreciation = $10,000 / 8 years
Annual depreciation = $1,250 per year

Step 3: Write the linear equation.
Let y be the book value of the equipment and x be the number of years since it was purchased.
Since the equipment depreciates by $1,250 each year, the slope of the linear equation is -1,250. The initial value is $12,000, which is the y-intercept.

The linear equation that describes the book value of the equipment each year is:
y = -1,250x + 12,000

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Answer:

29$

Step-by-step explanation:

2.50+2.50=5.00$ 5$+24$=29$

Answer:

Step-by-step explanation:

if they spent $24 originally and then each spent $2.50 together there were 3 friends $2.50 times 3 is 7.50 plus the original $24 equals $33.50

Answer:

8.3%

Step-by-step explanation:

There are 36 possible outcomes when rolling two number cubes, since there are 6 possible outcomes for the first cube and 6 possible outcomes for the second cube.

To find the probability of winning on the next turn, we need to count the number of outcomes that give a sum of 11 or 2. There are two ways to get a sum of 11:

rolling a 5 on the first cube and a 6 on the second cube, or rolling a 6 on the first cube and a 5 on the second cube.

There is only one way to get a sum of 2: rolling a 1 on the first cube and a 1 on the second cube.

So, the probability of winning on the next turn is:

(number of favorable outcomes) / (total number of possible outcomes) = (2 + 1) / 36 = 3/36

We can simplify this fraction by dividing both the numerator and the denominator by 3:

3/36 = 1/12

So, the probability of winning on the next turn is 1/12, or approximately 8.3% (rounded to the nearest tenth).

The answer is A. 36 different outcomes are possible when a pair of standard dice are rolled.

When a pair of standard dice are rolled, each die has 6 sides numbered 1 to 6. The total number of possible outcomes is equal to the total number of ways the two dice can land. To find the total number of different outcomes, we need to consider all the possible combinations of the numbers on the two dice.

Each die has 6 possible outcomes, so there are 6 x 6 = 36 possible outcomes for a pair of dice. These outcomes include all possible combinations of the numbers 1 to 6 that can be rolled on each die. For example, the outcomes include (1,1), (1,2), (1,3), ..., (6,5), and (6,6).

Therefore, the answer is A. 36 different outcomes are possible when a pair of standard dice are rolled.

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The numbers 3, 4, and 7 likely refer to specific shapes that are programmed into the toy's code and represented by specific patterns of 1s and 0s.

To understand how codecs work, it is helpful to think of them as translators. When digital information is transmitted, it is often compressed to reduce the amount of data that needs to be transmitted.

In the case of Tracy the turtle's shape toy, the codecs are responsible for encoding the shapes into digital information that can be transmitted to the toy's display. The toy's display then decodes this information to display the shapes. The numbers 3, 4, and 7 likely refer to specific patterns of 1s and 0s that represent the shapes programmed into the toy.

In mathematical terms, codecs use various algorithms to compress and decompress digital information. These algorithms often involve complex mathematical formulas that are used to analyze and reduce the amount of data that needs to be transmitted.

Codecs are an essential component of digital communication and are used in everything from video streaming to text messaging.

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Complete Question:

Does anyone know 3. 4. 7 Kid's Shapes Toy for Tracy the turtle in codecs?

the probability of drawing two citizens at random from different ethnic groups in country Q is 2 * q * (1-q).

To solve this problem, we can use the formula for calculating the probability of an event. Let's start by finding the probability of selecting a person from group A and then a person from group B.

The probability of selecting a person from group A is q, since q is the share of the population that belongs to this group.

Once we have selected a person from group A, the probability of selecting a person from group B is (1-q), since this is the share of the population that belongs to group B.

To find the probability of selecting a person from group A and then a person from group B, we multiply the probability of selecting a person from group A by the probability of selecting a person from group B:

q x (1-q)

To find the probability of selecting a person from group B and then a person from group A, we can use the same formula:

(1-q) x q

To find the total probability of selecting two people from different ethnic groups, we add the probability of selecting a person from group A and then a person from group B to the probability of selecting a person from group B and then a person from group A:

q x (1-q) + (1-q) x q

Simplifying this expression, we get:

2q(1-q)

Therefore, the probability of selecting two citizens at random from different ethnic groups is 2q(1-q).
Hi! In country Q, the share of the population belonging to ethnic group A is represented by q, while the share of the population belonging to ethnic group B is represented by (1-q). To find the probability of drawing two citizens at random from different ethnic groups, you can multiply the probabilities of each possible combination (AB or BA).

The probability of drawing one citizen from group A and then one from group B is: q * (1-q)

Similarly, the probability of drawing one citizen from group B and then one from group A is: (1-q) * q

To find the total probability, add these two probabilities together:
q * (1-q) + (1-q) * q = 2 * q * (1-q)

Therefore, the probability of drawing two citizens at random from different ethnic groups in country Q is 2 * q * (1-q).

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1. The area of the rectangle is increasing at a rate of 1926 [tex]cm^2/s[/tex] after 24 seconds.

2The equation relating the area, base, and height of a rectangle is:

A = b * h

where A is the area of the rectangle, b is the base (width), and h is the height (length).

To find the rate at which the area of the rectangle is increasing, we first need to find the equation for the area of the rectangle as a function of time.

Let x(t) be the length of one of the sides of the rectangle at time t.

Since all sides of the rectangle are increasing at the same rate of 5 cm/s, we have:

x(t) = 6 + 5t (for the width)

and

y(t) = 8 + 5t (for the length)

The area of the rectangle is given by:

A(t) = x(t) * y(t)

Substituting the expressions for x(t) and y(t), we get:

A(t) = (6 + 5t) * (8 + 5t) = 40t^2 + 86t + 48

To find the rate at which the area is increasing at t = 24 s, we take the derivative of A(t) with respect to t:

dA/dt = 80t + 86

At t = 24 s, we have:

dA/dt = 80(24) + 86 = 1926 cm^2/s

Therefore, the area of the rectangle is increasing at a rate of 1926 cm^2/s after 24 seconds.

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it's essential to use Leibniz notation when using separation of variables to solve differential equations.

When using separation of variables to solve a differential equation, we begin by separating the variables, typically denoted as y and x. This involves isolating all y terms on one side of the equation and all x terms on the other side.

At this point, we have an equation of the form f(y)dy = g(x)dx, where f(y) and g(x) are some functions of y and x, respectively. To solve for y, we integrate both sides of the equation with respect to their respective variables. However, it's important to use Leibniz notation (i.e., dy and dx) to keep track of which variable we are integrating with respect to.

Specifically, we write ∫ f(y)dy = ∫ g(x)dx, which means that we integrate f(y) with respect to y and g(x) with respect to x. If we were to use prime notation instead (i.e., y' and x'), it would be unclear which variable we were integrating with respect to, since both y' and x' represent derivatives.

After integrating both sides, we obtain an equation in terms of y and x that we can use to solve for y. This is why it's essential to use Leibniz notation when using separation of variables to solve differential equations.

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This means that the probability of transitioning from state 1 to state 2 in any positive amount of time is zero. we get: P₁₂(t) = 0

(a) d/dt Pij(t) = λ(i-1)P(i-1)j(t) - λiPij(t) (b) P₁₁(t) = exp(-λ1t) (c) exp(λ1t) P₁₂(t) = C1 exp(λ1t)

(a) The backward Kolmogorov equations for the Yule process are given by:

d/dt Pij(t) = λ(i-1)P(i-1)j(t) - λiPij(t)

where Pij(t) is the probability of being in state j at time t, given that the process is in state i at time 0.

(b) To find P₁₁(t), we start with the backward Kolmogorov equation for P₁₁(t):

d/dt P₁₁(t) = λ(1-1)P(1-1)1(t) - λ1P₁₁(t) = -λ1P₁₁(t)

This is a first-order ordinary differential equation with initial condition P₁₁(0) = 1. Solving it, we get:

P₁₁(t) = exp(-λ1t)

(c) To find P₁₂(t), we use the backward Kolmogorov equation for P12(t):

d/dt P₁₂(t) = λ(1-1)P(1-1)2(t) - λ1P₁₂(t) = -λ1P₁₂(t)

This is also a first-order ordinary differential equation, but with initial condition P12(0) = 0. To solve it, we use the integrating factor method:

d/dt [exp(λ1t) P₁₂(t)] = λ1 exp(λ1t) P₁₂(t)

Integrating both sides, we get:

exp(λ1t) P₁₂(t) = C1 exp(λ1t)

where C1 is a constant determined by the initial condition. Since P₁₂(0) = 0, we have:

C1 = 0

Therefore, we get: P₁₂(t) = 0

This means that the probability of transitioning from state 1 to state 2 in any positive amount of time is zero.

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The dialogue sows that the false statement is C. Raul and Eduardo knew each other before.

Exchange could be a composed or talked conversational trade between two or more individuals, and a scholarly and showy shape that portrays such an exchange.

Dialogue is your character's response to other characters, and the reason of exchange is communication between characters.” When somebody says something to another individual, unless he is fair making discussion, he needs the other individual to respond to what he is saying.

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The approximate population variance is 937.85.

To approximate the population variance, we need to calculate the sample variance first and then use the following formula to approximate the population variance:

Population variance ≈ (sample variance) × [(n)/(n-1)], where n is the sample size.

To calculate the sample variance, we need to first calculate the sample mean:

Sample mean = (Σ (midpoint of class interval × frequency))/n

= [(9.5 × 15) + (29.5 × 13) + (49.5 × 8) + (69.5 × 10) + (84.5 × 10)]/56

= 44.375

Next, we can use the formula for calculating the sample variance:

Sample variance = [(Σ(frequency × (midpoint of class interval - sample mean)^2))/(n-1)]

= [(15 × (9.5-44.375)^2) + (13 × (29.5-44.375)^2) + (8 × (49.5-44.375)^2) + (10 × (69.5-44.375)^2) + (10 × (84.5-44.375)^2)]/55

= 918.75

Finally, we can use the formula to approximate the population variance:

Population variance ≈ (sample variance) × [(n)/(n-1)]

= 918.75 × [(56)/(55)]

≈ 937.85

Therefore, the approximate population variance is 937.85.

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If vector v = 5i + 4j and vector w = 6i-9j, the vector v + w is 11i - 5j, and the vector v - w is -i + 13j.

To add two vectors written in i,j form, we simply add their corresponding components. In the example provided, vector v is written as 5i + 4j, and vector w is written as 6i - 9j. To find the sum of v and w, we simply add the i components together and the j components together. This gives us:

v + w = (5i + 4j) + (6i - 9j) = 11i - 5j

Similarly, to find the difference of v and w, we subtract their corresponding components:

v - w = (5i + 4j) - (6i - 9j) = -i + 13j

This method of adding and subtracting vectors can be used for any two vectors written in i,j form, as long as we remember to add or subtract the corresponding components of the vectors.

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Required value of θ is 67.38.

What are angles of right angle triangle?

In a right-angled triangle, one of the interior angles is a right angle, which measures exactly 90 degrees. The other two angles can vary in measure depending on the specific triangle. The side opposite the right angle is called the hypotenuse and the other two sides are called the legs .We can calculate the length of the hypotenuse .

According to Pythagoras theorem,

the addition of the squares of the lengths of the base and height equals the square of the length of the hypotenuse.The adjacent side divided by the hypotenuse in a right-angle triangle is equal to the cosine of one of the non-right angles .

So, in this triangle, cos(θ) = adjacent side/hypotenuse = 5/13.

To find θ, we need to take the inverse cosine (also called the arccosine) of both sides of the equation:

[tex] \theta = cos^{(-1)}( \frac{5}{13} )[/tex]

Using a calculator, we find that:

θ ≈ 67.38 degrees (rounded to hundredth decimal places)

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Correct question is " Find θ in degrees 12 13 5 round to the nearest hundredth"

The probability that a premium paid this year by a randomly selected worker is between $3331 and $4453 is approximately 0.7054 - 0.0934 = 0.6120.

a) To find the probability that a premium paid this year by a randomly selected worker is less than $3331, we need to standardize the value of $3331 using the mean and standard deviation of the population, and then find the corresponding probability using a standard normal distribution table or calculator.

Z-score = (x - μ) / σ = (3331 - 4129) / 600 = -1.32

Using a standard normal distribution table or calculator, we find that the probability of a standard normal random variable being less than -1.32 is approximately 0.0934.

Therefore, the probability that a premium paid this year by a randomly selected worker is less than $3331 is approximately 0.0934.

b) To find the probability that a premium paid this year by a randomly selected worker is greater than $4453, we need to standardize the value of $4453 using the mean and standard deviation of the population, and then find the corresponding probability using a standard normal distribution table or calculator.

Z-score = (x - μ) / σ = (4453 - 4129) / 600 = 0.54

Using a standard normal distribution table or calculator, we find that the probability of a standard normal random variable being greater than 0.54 is approximately 0.2946.

Therefore, the probability that a premium paid this year by a randomly selected worker is greater than $4453 is approximately 0.2946.

c) To find the probability that a premium paid this year by a randomly selected worker is between $3331 and $4453, we need to standardize these values using the mean and standard deviation of the population, and then find the corresponding probabilities and subtract them.

Z-score for $3331 = (3331 - 4129) / 600 = -1.32

Z-score for $4453 = (4453 - 4129) / 600 = 0.54

Using a standard normal distribution table or calculator, we find that the probability of a standard normal random variable being less than -1.32 is approximately 0.0934, and the probability of a standard normal random variable being less than 0.54 is approximately 0.7054.

Therefore, the probability that a premium paid this year by a randomly selected worker is between $3331 and $4453 is approximately 0.7054 - 0.0934 = 0.6120.

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The residual plot does not suggest that the regression equation is a bad model.

The residual plot shows the difference between the predicted values and the actual values for the dependent variable (oil production rate) at each year.

If the regression model is a good fit for the data, the residuals should be randomly scattered around zero, with no clear pattern or trend.

Looking at the residual plot provided, it appears that there is no clear pattern or trend in the residuals.

They are randomly scattered around zero, suggesting that the regression equation is a good fit for the data.

The discrepancy between the expected values and the actual values for the dependent variable (oil production rate) for each year is displayed on the residual plot.

The residuals should be randomly distributed around zero, with no discernible pattern or trend, if the regression model correctly fits the data.

There doesn't seem to be any obvious pattern or trend in the residuals, according to the given residual plot.

They are dispersed at random about zero, indicating that the regression equation well describes the data.

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