A population has the following breakdown:
15% children
25% teenagers
30% young adults
30% older adults
My sample has the following breakdown:
5% children
30% teenagers
15% young adults
50% older adult

Answers

Answer 1

The sample percentage is 100%, indicating that the entire population consists of the given age groups. To determine if the sample is representative, consider the percentages of children, teenagers, young adults, and older adults. The sample has 5% children, 25% teenagers, 30% young adults, and 50% older adults, making it unrepresentative of the population. This means that the sample does not contain enough of each age group, making inferences based on the sample may not be accurate.

The total sample percentage is 100%, thus we can infer that the entire sample population is made up of the given age groups.

We can use the concept of probability to determine whether the sample is representative of the population or not.Let us start by considering the children age group. The population has 15% children, whereas the sample has 5% children. Since 5% is less than 15%, it implies that the sample does not contain enough children, which makes it unrepresentative of the population.

To check for the teenagers' age group, the population has 25%, whereas the sample has 30%. Since 30% is greater than 25%, the sample has too many teenagers and, as such, is not representative of the population.The young adults' age group has 30% in the population and 15% in the sample. This means that the sample does not contain enough young adults and, therefore, is not representative of the population.

Finally, the older adult age group in the population has 30%, and in the sample, it has 50%. Since 50% is greater than 30%, the sample has too many older adults and, thus, is not representative of the population.In conclusion, we can say that the sample is not representative of the population because it does not have the same proportion of each age group as the population.

Therefore, any inference we make based on the sample may not be accurate. The sample is considered representative when it has the same proportion of each category as the population in general.

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Related Questions

Consider the polynomial (1)/(2)a^(4)+3a^(3)+a. What is the coefficient of the third term? What is the constant term?

Answers

The coefficient of the third term in the polynomial is 0, and the constant term is 0.

The third term in the polynomial is a, which means that it has a coefficient of 1. Therefore, the coefficient of the third term is 1. However, when we look at the entire polynomial, we can see that there is no constant term. This means that the value of the polynomial when a is equal to 0 is also 0, since there is no constant term to provide a non-zero value.

To find the coefficient of the third term, we simply need to look at the coefficient of the term with a degree of 1. In this case, that term is a, which has a coefficient of 1. Therefore, the coefficient of the third term is 1.

To find the constant term, we need to evaluate the polynomial when a is equal to 0. When we do this, we get:

(1)/(2)(0)^(4) + 3(0)^(3) + 0 = 0

Since the value of the polynomial when a is equal to 0 is 0, we know that there is no constant term in the polynomial. Therefore, the constant term is 0.

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15. Considering the following square matrices P
Q
R

=[ 5
1

−2
4

]
=[ 0
−4

7
9

]
=[ 3
8

8
−6

]

85 (a) Show that matrix multiplication satisfies the associativity rule, i.e., (PQ)R= P(QR). (b) Show that matrix multiplication over addition satisfies the distributivity rule. i.e., (P+Q)R=PR+QR. (c) Show that matrix multiplication does not satisfy the commutativity rule in geteral, s.e., PQ

=QP (d) Generate a 2×2 identity matrix. I. Note that the 2×2 identity matrix is a square matrix in which the elements on the main dingonal are 1 and all otber elements are 0 . Show that for a square matrix, matris multiplioation satiefies the rules P1=IP=P. 16. Solve the following system of linear equations using matrix algebra and print the results for unknowna. x+y+z=6
2y+5z=−4
2x+5y−z=27

Answers

Matrix multiplication satisfies the associativity rule A. We have (PQ)R = P(QR).

B. We have (P+Q)R = PR + QR.

C. We have PQ ≠ QP in general.

D. We have P I = IP = P.

E. 1/51 [-29 12 17; 10 -3 -2; 25 -10 -7]

(a) We have:

(PQ)R = ([5 1; -2 4] [0 -4; 7 9]) [3 8; 8 -6]

= [(-14) 44; (28) (-20)] [3 8; 8 -6]

= [(-14)(3) + 44(8) (-14)(8) + 44(-6); (28)(3) + (-20)(8) (28)(8) + (-20)(-6)]

= [244 112; 44 256]

P(QR) = [5 1; -2 4] ([0 7; -4 9] [3 8; 8 -6])

= [5 1; -2 4] [56 -65; 20 -28]

= [5(56) + 1(20) 5(-65) + 1(-28); -2(56) + 4(20) -2(-65) + 4(-28)]

= [300 -355; 88 -134]

Thus, we have (PQ)R = P(QR).

(b) We have:

(P+Q)R = ([5 1; -2 4] + [0 -4; 7 9]) [3 8; 8 -6]

= [5 -3; 5 13] [3 8; 8 -6]

= [5(3) + (-3)(8) 5(8) + (-3)(-6); 5(3) + 13(8) 5(8) + 13(-6)]

= [-19 46; 109 22]

PR + QR = [5 1; -2 4] [3 8; 8 -6] + [0 -4; 7 9] [3 8; 8 -6]

= [5(3) + 1(8) (-2)(8) + 4(-6); (-4)(3) + 9(8) (7)(3) + 9(-6)]

= [7 -28; 68 15]

Thus, we have (P+Q)R = PR + QR.

(c) We have:

PQ = [5 1; -2 4] [0 -4; 7 9]

= [5(0) + 1(7) 5(-4) + 1(9); (-2)(0) + 4(7) (-2)(-4) + 4(9)]

= [7 -11; 28 34]

QP = [0 -4; 7 9] [5 1; -2 4]

= [0(5) + (-4)(-2) 0(1) + (-4)(4); 7(5) + 9(-2) 7(1) + 9(4)]

= [8 -16; 29 43]

Thus, we have PQ ≠ QP in general.

(d) The 2×2 identity matrix is given by:

I = [1 0; 0 1]

For any square matrix P, we have:

P I = [P11 P12; P21 P22] [1 0; 0 1]

= [P11(1) + P12(0) P11(0) + P12(1); P21(1) + P22(0) P21(0) + P22(1)]

= [P11 P12; P21 P22] = P

Similarly, we have:

IP = [1 0; 0 1] [P11 P12; P21 P22]

= [1(P11) + 0(P21) 1(P12) + 0(P22); 0(P11) + 1(P21) 0(P12) + 1(P22)]

= [P11 P12; P21 P22] = P

Thus, we have P I = IP = P.

(e) The system of linear equations can be written in matrix form as:

[1 1 1; 0 2 5; 2 5 -1] [x; y; z] = [6; -4; 27]

We can solve for [x; y; z] using matrix inversion:

[1 1 1; 0 2 5; 2 5 -1]⁻¹ = 1/51 [-29 12 17; 10 -3 -2; 25 -10 -7]

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Post Test: Solving Quadratic Equations he tlles to the correct boxes to complete the pairs. Not all tlles will be used. each quadratic equation with its solution set. 2x^(2)-8x+5=0,2x^(2)-10x-3=0,2

Answers

The pairs of quadratic equations with their respective solution sets are:(1) `2x² - 8x + 5 = 0` with solution set `x = {2 ± (sqrt(6))/2}`(2) `2x² - 10x - 3 = 0` with solution set `x = {5 ± sqrt(31)}/2`.

The solution of each quadratic equation with its corresponding equation is given below:Quadratic equation 1: `2x² - 8x + 5 = 0`The quadratic formula for the equation is `x = [-b ± sqrt(b² - 4ac)]/(2a)`Comparing the equation with the standard quadratic form `ax² + bx + c = 0`, we can say that the values of `a`, `b`, and `c` for this equation are `2`, `-8`, and `5`, respectively.Substituting the values in the quadratic formula, we get: `x = [8 ± sqrt((-8)² - 4(2)(5))]/(2*2)`Simplifying the expression, we get: `x = [8 ± sqrt(64 - 40)]/4`So, `x = [8 ± sqrt(24)]/4`Now, simplifying the expression further, we get: `x = [8 ± 2sqrt(6)]/4`Dividing both numerator and denominator by 2, we get: `x = [4 ± sqrt(6)]/2`Simplifying the expression, we get: `x = 2 ± (sqrt(6))/2`Therefore, the solution set for the given quadratic equation is `x = {2 ± (sqrt(6))/2}`Quadratic equation 2: `2x² - 10x - 3 = 0`Comparing the equation with the standard quadratic form `ax² + bx + c = 0`, we can say that the values of `a`, `b`, and `c` for this equation are `2`, `-10`, and `-3`, respectively.We can use either the quadratic formula or factorization method to solve this equation.Using the quadratic formula, we get: `x = [10 ± sqrt((-10)² - 4(2)(-3))]/(2*2)`Simplifying the expression, we get: `x = [10 ± sqrt(124)]/4`Now, simplifying the expression further, we get: `x = [5 ± sqrt(31)]/2`Therefore, the solution set for the given quadratic equation is `x = {5 ± sqrt(31)}/2`Thus, the pairs of quadratic equations with their respective solution sets are:(1) `2x² - 8x + 5 = 0` with solution set `x = {2 ± (sqrt(6))/2}`(2) `2x² - 10x - 3 = 0` with solution set `x = {5 ± sqrt(31)}/2`.

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Determine limx→[infinity]​f(x) and limx→−[infinity]​f(x) for the following function. Then give the horizontal asymptotes of f, if any. f(x)=36x+66x​ Evaluate limx→[infinity]​f(x). Select the correct choice below and, if necessary, fill in the answer box to complete your choice. A. limx→[infinity]​36x+66x​=( Simplify your answer. ) B. The limit does not exist and is neither [infinity] nor −[infinity]. Evaluate limx→−[infinity]​f(x). Select the correct choice below and, if necessary, fill in the answer box to complete your choice. A. limx→−[infinity]​36x+66x​= (Simplify your answer.) B. The limit does not exist and is neither [infinity] nor −[infinity]. Give the horizontal asymptotes of f, if any. Select the correct choice below and, if necessary, fill in the answer box(es) to complete your choice. A. The function has one horizontal asymptote, (Type an equation.) B. The function has two horizontal asymptotes. The top asymptote is and the bottom asymptote is (Type equations.) C. The function has no horizontal asymptotes.

Answers

The limit limx→[infinity]​f(x) = 36, limx→−[infinity]​f(x) = 36. The function has one horizontal asymptote, y = 36. Option (a) is correct.

Given function is f(x) = 36x + 66x⁻¹We need to evaluate limx→∞​f(x) and limx→-∞​f(x) and find horizontal asymptotes, if any.Evaluate limx→∞​f(x):limx→∞​f(x) = limx→∞​(36x + 66x⁻¹)= limx→∞​(36x/x + 66/x⁻¹)We get  ∞/∞ form and hence we apply L'Hospital's rulelimx→∞​f(x) = limx→∞​(36 - 66/x²) = 36

The limit exists and is finite. Hence the correct choice is A) limx→∞​36x+66x​=36.Evaluate limx→−∞​f(x):limx→-∞​f(x) = limx→-∞​(36x + 66x⁻¹)= limx→-∞​(36x/x + 66/x⁻¹)

We get -∞/∞ form and hence we apply L'Hospital's rulelimx→-∞​f(x) = limx→-∞​(36 + 66/x²) = 36

The limit exists and is finite. Hence the correct choice is A) limx→−∞​36x+66x​=36.  Hence the horizontal asymptote is y = 36. Hence the correct choice is A) The function has one horizontal asymptote, y = 36.

The limit limx→[infinity]​f(x) = 36, limx→−[infinity]​f(x) = 36. The function has one horizontal asymptote, y = 36.

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Describe and correct the error in solving the equation. 40. -m/-3 = −4 ⋅ ( − m — 3 ) = 3 ⋅ (−4) m = −12

Answers

Answer:

m = -36/11

Step-by-step explanation:

Start with the equation: -m/-3 = −4 ⋅ ( − m — 3 )

2. Simplify the left side of the equation by canceling out the negatives: -m/-3 becomes m/3.

3. Simplify the right side of the equation by distributing the negative sign: −4 ⋅ ( − m — 3 ) becomes 4m + 12.

after simplification, we have: m/3 = 4m + 12.

Now, let's analyze the error in this step. The mistake occurs when distributing the negative sign to both terms inside the parentheses. The correct distribution should be:

−4 ⋅ ( − m — 3 ) = 4m + (-4)⋅(-3)

By multiplying -4 with -3, we get a positive value of 12. Therefore, the correct simplification should be:

−4 ⋅ ( − m — 3 ) = 4m + 12

solving the equation correctly:

Start with the corrected equation: m/3 = 4m + 12

To eliminate fractions, multiply both sides of the equation by 3: (m/3) * 3 = (4m + 12) * 3

This simplifies to: m = 12m + 36

Next, isolate the variable terms on one side of the equation. Subtract 12m from both sides: m - 12m = 12m + 36 - 12m

Simplifying further, we get: -11m = 36

Finally, solve for m by dividing both sides of the equation by -11: (-11m)/(-11) = 36/(-11)

This yields: m = -36/11

Determine limx→[infinity]​f(x) and limx→−[infinity]​f(x) for the following function. Then give the horizontal asymptotes of f (if any). f(x)=19x4−2x41x5+3x2​ Select the correct choice below and, if necessary, fill in the answer box to complete your choice. A. limx→[infinity]​f(x)= (Simplify your answer.) B. The limit does not exist and is neither [infinity] nor −[infinity]. Select the correct choice below and, if necessary, fill in the answer box to complete your choice. A. limx→−[infinity]​f(x)= (Simplify your answer.) B. The limit does not exist and is neither [infinity] nor −[infinity]. Identify the horizontal asymptotes. Select the correct choice below and, if necessary, fill in the answer box(es) to complete your choice. A. The function has one horizontal asymptote, (Type an equation using y as the variable.) B. The function has two horizontal asymptotes. The top asymptote is and the bottom asymptote is (Type equations using y as the variable.) C. The function has no horizontal asymptotes.

Answers

The function has one horizontal asymptote, which is the x-axis `y=0`.

Given function is `f(x)=19x^4−2x^4/(1x^5+3x^2)` To determine `lim x→[infinity]​f(x)` and `lim x→−[infinity]​f(x)` for the above function, we have to perform the following steps:

Step 1: First, we find out the degree of the numerator (p) and the degree of the denominator (q).p = 4q = 5 Therefore, q > p.

Step 2: Now, we can find the horizontal asymptote by using the formula: `y = 0`

Step 3: Determine the limits:` lim x→[infinity]​f(x)`Using the formula, the horizontal asymptote is `y = 0`When x approaches positive infinity, we get: `lim x→[infinity]​f(x) = 19x^4/1x^5 = 19/x`.

Since the numerator (p) is smaller than the denominator (q), the limit is equal to zero.

Hence, `lim x→[infinity]​f(x) = 0`. The horizontal asymptote is `y = 0`.`lim x→−[infinity]​f(x)`Using the formula, the horizontal asymptote is `y = 0`When x approaches negative infinity, we get: `lim x→−[infinity]​f(x) = 19x^4/1x^5 = 19/x`.

Since the numerator (p) is smaller than the denominator (q), the limit is equal to zero. Hence, `lim x→−[infinity]​f(x) = 0`.

The horizontal asymptote is `y = 0`.Thus, the answer is A. The function has one horizontal asymptote, which is the x-axis `y=0`.

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A sculptor cuts a pyramid from a marble cube with volume
t3 ft3
The pyramid is t ft tall. The area of the base is
t2 ft2
Write an expression for the volume of marble removed.

Answers

The expression for the volume of marble removed is (2t³/3).

The given information is as follows:

A sculptor cuts a pyramid from a marble cube with volume t^3 ft^3

The pyramid is t ft tall

The area of the base is t^2 ft^2

The formula to calculate the volume of a pyramid is,V = 1/3 × B × h

Where, B is the area of the base

h is the height of the pyramid

In the given scenario, the base of the pyramid is a square with the length of each side equal to t ft.

Thus, the area of the base is t² ft².

Hence, the expression for the volume of marble removed is given by the difference between the volume of the marble cube and the volume of the pyramid.

V = t³ - (1/3 × t² × t)V

   = t³ - (t³/3)V

    = (3t³/3) - (t³/3)V

   = (2t³/3)

Therefore, the expression for the volume of marble removed is (2t³/3).

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Solve the equation.
2x+3-2x = -+²x+5
42
If necessary:
Combine Terms
Apply properties:
Add
Multiply
Subtract
Divide

Answers

The solution to the equation is -1.5 or -3/2.

How to solve equations?

We have the equation:

x² + 3-2x= 1+ x² +5

Combine Terms and subtract x² from both sides:

x² - x² + 3 -2x = 1 + 5 + x² - x²

3 -2x = 1 + 5

Add:

3 -2x = 6

Combine Terms and subtract 3 from both sides:

-2x + 3 -3 = 6 - 3

-2x = 3

Dividing by -2 we get:

x = 3/(-2)

x = -3/2

x = -1.5

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se the dataset below to learn a decision tree which predicts the class 1 or class 0 for each data point.

Answers

To learn a decision tree that predicts the class (either class 1 or class 0) for each data point, you would need to calculate the entropy of the dataset, calculate the information gain for each attribute, choose the attribute with the highest information gain as the root node, split the dataset based on that attribute, and continue recursively until you reach pure classes or no more attributes to split.

To learn a decision tree that predicts the class (either class 1 or class 0) for each data point, we need to follow these steps:

1. Start by calculating the entropy of the entire dataset. Entropy is a measure of impurity in a set of examples. If we have more mixed classes in the dataset, the entropy will be higher. If all examples belong to the same class, the entropy will be zero.

2. Next, calculate the information gain for each attribute in the dataset. Information gain measures how much entropy is reduced after splitting the dataset on a particular attribute. The attribute with the highest information gain is chosen as the root node of the decision tree.

3. Split the dataset based on the chosen attribute and create child nodes for each possible value of that attribute. Repeat the previous steps recursively for each child node until we reach a pure class or no more attributes to split.

4. To make predictions, traverse the decision tree by following the path based on the attribute values of the given data point. The leaf node reached will determine the predicted class.

5. Evaluate the accuracy of the decision tree by comparing the predicted classes with the actual classes in the dataset.

For example, let's say we have a dataset with 100 data points and 30 belong to class 1 while the remaining 70 belong to class 0. The initial entropy of the dataset would be calculated using the formula for entropy. Then, we calculate the information gain for each attribute and choose the one with the highest value as the root node. We continue splitting the dataset until we have pure classes or no more attributes to split.

Finally, we can use the decision tree to predict the class of new data points by traversing the tree based on the attribute values.


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Two friends, Hayley and Tori, are working together at the Castroville Cafe today. Hayley works every 8 days, and Tori works every 4 days. How many days do they have to wait until they next get to work

Answers

Hayley and Tori will have to wait 8 days until they next get to work together.

To determine the number of days they have to wait until they next get to work together, we need to find the least common multiple (LCM) of their work cycles, which are 8 days for Hayley and 4 days for Tori.

The LCM of 8 and 4 is the smallest number that is divisible by both 8 and 4. In this case, it is 8, as 8 is divisible by both 8 and 4.

Therefore, Hayley and Tori will have to wait 8 days until they next get to work together.

We can also calculate this by considering the cycles of their work schedules. Hayley works every 8 days, so her work days are 8, 16, 24, 32, and so on. Tori works every 4 days, so her work days are 4, 8, 12, 16, 20, 24, and so on. The common day in both schedules is 8, which means they will next get to work together on day 8.

Hence, the answer is that they have to wait 8 days until they next get to work together.

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1) There are approximately 2.54 centimeters in 1 inch. What is the distance, in inches, of 14 centimeters? Use a proportion to solve and round your answer to the nearest tenth of an inch?

Jon just received a job offer that will pay him 12% more than what he makes at his current job. If the salary at the new job is $68,000, what is his current salary? Round to the nearest cent?

Determine which property is illustrated by the following examples: Commutative, Associative, Distributive, Identity

a) 0 + a = a

b) −2(x-7)= -2x+14

c) 2/5(15x) = (2/5 (times 15)x

d) -5+7+7+(-5)

2) Simplify 3[2 – 4(5x + 2)]

3) Evaluate 2 x xy − 5 for x = –3 and y = –2

Answers

1) The given information is, 1 inch = 2.54 centimeters. Distance in centimeters = 14 Ceto find: The distance in inches Solution: We can use the proportion method to solve this problem

.1 inch/2.54 cm

= x inch/14 cm.

Now we cross multiply to get's

inch = (1 inch × 14 cm)/2.54 cmx inch = 5.51 inch

Therefore, the distance in inches is 5.51 inches (rounded to the nearest tenth of an inch).2) Given: The s

First, we solve the expression inside the brackets.

2 - 4(5x + 2

)= 2 - 20x - 8

= -20x - 6

Then, we can substitute this value in the original expression.

3[-20x - 6]

= -60x - 18

Therefore, the simplified expression is -60x - 18.5) Evaluating the given expression:

2 x xy − 5

for

x = –3 a

nd

y = –2

.Substituting x = –3 and y = –2 in the given expression, we get:

2 x xy − 5= 2 x (-3) (-2) - 5= 12

Therefore, the value of the given expression is 12.

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help plssssssssssssssss

Answers

The third one - I would give an explanation but am currently short on time, hope this is enough.

Give three examples of Bernoulli rv's (other than those in the text). (Select all that apply.) X=1 if a randomly selected lightbulb needs to be replaced and X=0 otherwise. X - the number of food items purchased by a randomly selected shopper at a department store and X=0 if there are none. X= the number of lightbulbs that needs to be replaced in a randomly selected building and X=0 if there are none. X= the number of days in a year where the high temperature exceeds 100 degrees and X=0 if there are none. X=1 if a randomly selected shopper purchases a food item at a department store and X=0 otherwise. X=1 if a randomly selected day has a high temperature of over 100 degrees and X=0 otherwise.

Answers

A Bernoulli distribution represents the probability distribution of a random variable with only two possible outcomes.

Three examples of Bernoulli rv's are as follows:

X = 1 if a randomly selected lightbulb needs to be replaced and X = 0 otherwise X = 1 if a randomly selected shopper purchases a food item at a department store and X = 0 otherwise X = 1 if a randomly selected day has a high temperature of over 100 degrees and X = 0 otherwise. These are the Bernoulli random variables. A Bernoulli trial is a random experiment that has two outcomes: success and failure. These trials are used to create Bernoulli random variables (r.v. ) that follow a Bernoulli distribution.

In Bernoulli's distribution, p denotes the probability of success, and q = 1 - p denotes the probability of failure. It's a type of discrete probability distribution that describes the probability of a single Bernoulli trial. the above three Bernoulli rv's that are different from those given in the text.

A Bernoulli distribution represents the probability distribution of a random variable with only two possible outcomes.

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Solve the problem. Show your work. There are 95 students on a field trip and 19 students on each buls. How many buses of students are there on the field trip?

Answers

Sorry for bad handwriting

if i was helpful Brainliests my answer ^_^

a firm offers rutine physical examinations as a part of a health service program for its employees. the exams showed that 28% of the employees needed corrective shoes, 35% needed major dental work, and 3% needed both corrective shoes and major dental work. what is the probability that an employee selected at random will need either corrective shoes or major dental work?

Answers

If a firm offers rutine physical examinations as a part of a health service program for its employees. The probability that an employee selected at random will need either corrective shoes or major dental work is 60%.

What is the probability?

Let the probability of needing corrective shoes be P(CS) and the probability of needing major dental work be P(MDW).

P(CS) = 28% = 0.28

P(MDW) = 35% = 0.35

Now let calculate the probability of needing either corrective shoes or major dental work

P(CS or MDW) = P(CS) + P(MDW) - P(CS and MDW)

P(CS or MDW) = 0.28 + 0.35 - 0.03

P(CS or MDW) = 0.60

Therefore the probability  is 0.60 or 60%.

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A placement test for state university freshmen has a normal distribution with a mean of 900 and a standard deviation of 20. The bottom 3% of students must take a summer session. What is the minimum score you would need to stay out of this group?

Answers

The minimum score a student would need to stay out of the group that must take a summer session is 862.4.

We need to find the minimum score that a student needs to avoid being in the bottom 3%.

To do this, we can use the z-score formula:

z = (x - μ) / σ

where x is the score we want to find, μ is the mean, and σ is the standard deviation.

If we can find the z-score that corresponds to the bottom 3% of the distribution, we can then use it to find the corresponding score.

Using a standard normal table or calculator, we can find that the z-score that corresponds to the bottom 3% of the distribution is approximately -1.88. This means that the bottom 3% of students have scores that are more than 1.88 standard deviations below the mean.

Now we can plug in the values we know and solve for x:

-1.88 = (x - 900) / 20

Multiplying both sides by 20, we get:

-1.88 * 20 = x - 900

Simplifying, we get:

x = 862.4

Therefore, the minimum score a student would need to stay out of the group that must take a summer session is 862.4.

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using the curve fitting technique, determine the cubic fit for the following data. use the matlab commands polyfit, polyval and plot (submit the plot with the data below and the fitting curve).

Answers

The MATLAB commands polyfit, polyval and plot data is used .

To determine the cubic fit for the given data using MATLAB commands, we can use the polyfit and polyval functions. Here's the code to accomplish that:

x = [10 20 30 40 50 60 70 80 90 100];

y = [10.5 20.8 30.4 40.6 60.7 70.8 80.9 90.5 100.9 110.9];

% Perform cubic curve fitting

coefficients = polyfit( x, y, 3 );

fitted_curve = polyval( coefficients, x );

% Plotting the data and the fitting curve

plot( x, y, 'o', x, fitted_curve, '-' )

title( 'Fitting Curve' )

xlabel( 'X-axis' )

ylabel( 'Y-axis' )

legend( 'Data', 'Fitted Curve' )

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The complete question is :

Using the curve fitting technique, determine the cubic fit for the following data. Use the MATLAB commands polyfit, polyval and plot (submit the plot with the data below and the fitting curve). Include plot title "Fitting Curve," and axis labels: "X-axis" and "Y-axis."

x = 10 20 30 40 50 60 70 80 90 100

y = 10.5 20.8 30.4 40.6  60.7 70.8 80.9 90.5 100.9 110.9

There are 4 red, 5 green, 5 white, and 6 blue marbles in a bag. If you select 2 marbles, what is the probability that you will select a blue and a white marble? Give the solution in percent to the nearest hundredth.

Answers

The probability of selecting a blue and a white marble is approximately 15.79%.

The total number of marbles in the bag is:

4 + 5 + 5 + 6 = 20

To calculate the probability of selecting a blue marble followed by a white marble, we can use the formula:

Probability = (Number of ways to select a blue marble) x (Number of ways to select a white marble) / (Total number of ways to select 2 marbles)

The number of ways to select a blue marble is 6, and the number of ways to select a white marble is 5. The total number of ways to select 2 marbles from 20 is:

20 choose 2 = (20!)/(2!(20-2)!) = 190

Substituting these values into the formula, we get:

Probability = (6 x 5) / 190 = 0.15789473684

Rounding this to the nearest hundredth gives us a probability of 15.79%.

Therefore, the probability of selecting a blue and a white marble is approximately 15.79%.

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Assuming the population has an approximate normal distribution, if a sample size n = 30 has a sample mean = 41 with a sample standard deviation s = 10, find the margin of error at a 98% confidence level.
("Margin of error" is the same as "EBM - Error Bound for a population Mean" in your text and notesheet.) Round the answer to two decimal places.

Answers

The margin of error at a 98% confidence level is approximately 4.26.To find the margin of error (EBM - Error Bound for a Population Mean) at a 98% confidence level.

We need to use the formula:

Margin of Error = Z * (s / sqrt(n))

where Z is the z-score corresponding to the desired confidence level, s is the sample standard deviation, and n is the sample size.

For a 98% confidence level, the corresponding z-score is 2.33 (obtained from the standard normal distribution table).

Plugging in the values into the formula:

Margin of Error = 2.33 * (10 / sqrt(30))

Calculating the square root and performing the division:

Margin of Error ≈ 2.33 * (10 / 5.477)

Margin of Error ≈ 4.26

Therefore, the margin of error at a 98% confidence level is approximately 4.26.

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Aiden is 2 years older than Aliyah. In 8 years the sum of their ages will be 82 . How old is Aiden now?

Answers

Aiden is currently 34 years old, and Aliyah is currently 32 years old.

Let's start by assigning variables to the ages of Aiden and Aliyah. Let A represent Aiden's current age and let B represent Aliyah's current age.

According to the given information, Aiden is 2 years older than Aliyah. This can be represented as A = B + 2.

In 8 years, Aiden's age will be A + 8 and Aliyah's age will be B + 8.

The problem also states that in 8 years, the sum of their ages will be 82. This can be written as (A + 8) + (B + 8) = 82.

Expanding the equation, we have A + B + 16 = 82.

Now, let's substitute A = B + 2 into the equation: (B + 2) + B + 16 = 82.

Combining like terms, we have 2B + 18 = 82.

Subtracting 18 from both sides of the equation: 2B = 64.

Dividing both sides by 2, we find B = 32.

Aliyah's current age is 32 years. Since Aiden is 2 years older, we can calculate Aiden's current age by adding 2 to Aliyah's age: A = B + 2 = 32 + 2 = 34.

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2.3 Consider the equation
1- x² = ɛe¯x.
(a) Sketch the functions in this equation and then use this to explain why there are two solutions and describe where they are located for small values of ε.
(b) Find a two-term asymptotic expansion, for small ε, of each solution.
(c) Find a three-term asymptotic expansion, for small ε, of each solution.

Answers

(a) The equation 1 - x² = ɛe¯x represents a transcendental equation that combines a polynomial function (1 - x²) with an exponential function (ɛe¯x). To sketch the functions, we can start by analyzing each term separately. The polynomial function 1 - x² represents a downward-opening parabola with its vertex at (0, 1) and intersects the x-axis at x = -1 and x = 1. On the other hand, the exponential function ɛe¯x represents a decreasing exponential curve that approaches the x-axis as x increases.

For small values of ε, the exponential term ɛe¯x becomes very small, causing the curve to hug the x-axis closely. As a result, the intersection points between the polynomial and exponential functions occur close to the x-intercepts of the polynomial (x = -1 and x = 1). Since the exponential function is decreasing, there will be two solutions to the equation, one near each x-intercept of the polynomial.

(b) To find a two-term asymptotic expansion for small ε, we assume that ε is a small parameter. We can expand the exponential function using its Maclaurin series:

ɛe¯x = ɛ(1 - x + x²/2 - x³/6 + ...)

Substituting this expansion into the equation 1 - x² = ɛe¯x, we get:

1 - x² = ɛ - ɛx + ɛx²/2 - ɛx³/6 + ...

Ignoring terms of higher order than ε, we obtain a quadratic equation:

x² - εx + (1 - ε/2) = 0.

Solving this quadratic equation gives us the two-term asymptotic expansion for each solution.

(c) To find a three-term asymptotic expansion for small ε, we include one more term from the exponential expansion:

ɛe¯x = ɛ(1 - x + x²/2 - x³/6 + ...)

Substituting this expansion into the equation 1 - x² = ɛe¯x, we get:

1 - x² = ɛ - ɛx + ɛx²/2 - ɛx³/6 + ...

Ignoring terms of higher order than ε, we obtain a cubic equation:

x² - εx + (1 - ε/2) - ɛx³/6 + ...

Solving this cubic equation gives us the three-term asymptotic expansion for each solution.

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Suppose the number of students in Five Points on a weekend right is normaly distributed with mean 2096 and standard deviabon fot2. What is the probability that the number of studenss on a ghen wewhend night is greater than 1895 ? Round to three decimal places.

Answers

the probability that the number of students on a weekend night is greater than 1895 is approximately 0 (rounded to three decimal places).

To find the probability that the number of students on a weekend night is greater than 1895, we can use the normal distribution with the given mean and standard deviation.

Let X be the number of students on a weekend night. We are looking for P(X > 1895).

First, we need to standardize the value 1895 using the z-score formula:

z = (x - μ) / σ

where x is the value we want to standardize, μ is the mean, and σ is the standard deviation.

In this case, x = 1895, μ = 2096, and σ = 2.

Plugging in the values, we have:

z = (1895 - 2096) / 2

z = -201 / 2

z = -100.5

Next, we need to find the area under the standard normal curve to the right of z = -100.5. Since the standard normal distribution is symmetric, the area to the right of -100.5 is the same as the area to the left of 100.5.

Using a standard normal distribution table or a calculator, we find that the area to the left of 100.5 is very close to 1.000. Therefore, the area to the right of -100.5 (and hence to the right of 1895) is approximately 1.000 - 1.000 = 0.

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find the standard form of the equation of the parabola given that the vertex at (2,1) and the focus at (2,4)

Answers

Thus, the standard form of the equation of the parabola with the vertex at (2, 1) and the focus at (2, 4) is [tex]x^2 - 4x - 12y + 16 = 0.[/tex]

To find the standard form of the equation of a parabola given the vertex and focus, we can use the formula:

[tex](x - h)^2 = 4p(y - k),[/tex]

where (h, k) represents the vertex of the parabola, and (h, k + p) represents the focus.

In this case, we are given that the vertex is at (2, 1) and the focus is at (2, 4).

Comparing the given information with the formula, we can see that the vertex coordinates match (h, k) = (2, 1), and the y-coordinate of the focus is k + p = 1 + p = 4. Therefore, p = 3.

Now, substituting the values into the formula, we have:

[tex](x - 2)^2 = 4(3)(y - 1).[/tex]

Simplifying the equation:

[tex](x - 2)^2 = 12(y - 1).[/tex]

Expanding the equation:

[tex]x^2 - 4x + 4 = 12y - 12.[/tex]

Rearranging the equation:

[tex]x^2 - 4x - 12y + 16 = 0.[/tex]

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Amy bought 4lbs.,9oz. of turkey cold cuts and 3lbs,12oz. of ham cold cuts. How much did she buy in total? (You should convert any ounces over 15 into pounds) pounds ounces.

Answers

Amy bought a total of 8 pounds, 5 ounces (or 8.3125 pounds) of cold cuts.

To find the total amount of cold cuts Amy bought, we need to add the weights of turkey and ham together. However, we need to ensure that the ounces are properly converted to pounds if they exceed 15.

Turkey cold cuts: 4 lbs, 9 oz

Ham cold cuts: 3 lbs, 12 oz

To convert the ounces to pounds, we divide them by 16 since there are 16 ounces in 1 pound.

Converting turkey cold cuts:

9 oz / 16 = 0.5625 lbs

Adding the converted ounces to the pounds:

4 lbs + 0.5625 lbs = 4.5625 lbs

Converting ham cold cuts:

12 oz / 16 = 0.75 lbs

Adding the converted ounces to the pounds:

3 lbs + 0.75 lbs = 3.75 lbs

Now we can find the total amount of cold cuts:

4.5625 lbs (turkey) + 3.75 lbs (ham) = 8.3125 lbs

Therefore, Amy bought a total of 8 pounds and 5.25 ounces (or approximately 8 pounds, 5 ounces) of cold cuts.

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{(-1,-6),(5,-8),(-2,8),(3,-2),(-4,-2),(-5,-5)} Determine the values in the domain and range of the relation. Enter repeated values only once.

Answers

Domain: {-1, 5, -2, 3, -4, -5}, Range: {-6, -8, 8, -2, -5}. These sets represent the distinct values that appear as inputs and outputs in the given relation.

To determine the values in the domain and range of the given relation, we can examine the set of ordered pairs provided.

The given set of ordered pairs is: {(-1, -6), (5, -8), (-2, 8), (3, -2), (-4, -2), (-5, -5)}

(a) Domain: The domain refers to the set of all possible input values (x-values) in the relation. We can determine the domain by collecting all unique x-values from the given ordered pairs.

From the set of ordered pairs, we have the following x-values: -1, 5, -2, 3, -4, -5

Therefore, the domain of the relation is {-1, 5, -2, 3, -4, -5}.

(b) Range: The range represents the set of all possible output values (y-values) in the relation. Similarly, we need to collect all unique y-values from the given ordered pairs.

From the set of ordered pairs, we have the following y-values: -6, -8, 8, -2, -5

Therefore, the range of the relation is {-6, -8, 8, -2, -5}

It's worth noting that the order in which the elements are listed in the sets does not matter, as sets are typically unordered.

It's important to understand that the domain and range of a relation can vary depending on the specific set of ordered pairs provided. In this case, the given set uniquely determines the domain and range of the relation.

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Write a slope-intercept equation for a line with the given characteristics. m=− 3/4, passes through (−3,−4)

Answers

The slope-intercept equation for the line with a slope of[tex]\(-3/4\)[/tex] and passing through the point [tex]\((-3, -4)\)[/tex]is:

[tex]\(y = -\frac{3}{4}x - \frac{25}{4}\)[/tex]

The slope-intercept form of a linear equation is given by y = mx + b, where \(m\) represents the slope and \(b\) represents the y-intercept.

In this case, the slope m is given as[tex]\(-3/4\),[/tex] and the line passes through the point [tex]\((-3, -4)\)[/tex].

To find the y-intercept [tex](\(b\)),[/tex] we can substitute the coordinates of the given point into the equation and solve for b.

So, we have:

[tex]\(-4 = \frac{-3}{4} \cdot (-3) + b\)[/tex]

Simplifying the equation:

[tex]\(-4 = \frac{9}{4} + b\)[/tex]

To isolate \(b\), we can subtract [tex]\(\frac{9}{4}\)[/tex]from both sides:

[tex]\(-4 - \frac{9}{4} = b\)[/tex]

Combining the terms:

[tex]\(-\frac{16}{4} - \frac{9}{4} = b\)[/tex]

Simplifying further:

[tex]\(-\frac{25}{4} = b\)[/tex]

Now we have the value of b, which is [tex]\(-\frac{25}{4}\)[/tex].

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estimate the number of calory in one cubic mile of chocalte ice cream. there are 5280 feet in a mile. and one cubic feet of chochlate ice cream, contain about 48,600 calories

Answers

The number of calory in one cubic mile of chocolate ice cream. there are 5280 feet in a mile. and one cubic feet of chocolate ice cream there are approximately 7,150,766,259,200,000 calories in one cubic mile of chocolate ice cream.

To estimate the number of calories in one cubic mile of chocolate ice cream, we need to consider the conversion factors and calculations involved.

Given:

- 1 mile = 5280 feet

- 1 cubic foot of chocolate ice cream = 48,600 calories

First, let's calculate the volume of one cubic mile in cubic feet:

1 mile = 5280 feet

So, one cubic mile is equal to (5280 feet)^3.

Volume of one cubic mile = (5280 ft)^3 = (5280 ft)(5280 ft)(5280 ft) = 147,197,952,000 cubic feet

Next, we need to calculate the number of calories in one cubic mile of chocolate ice cream based on the given calorie content per cubic foot.

Number of calories in one cubic mile = (Number of cubic feet) x (Calories per cubic foot)

                                   = 147,197,952,000 cubic feet x 48,600 calories per cubic foot

Performing the calculation:

Number of calories in one cubic mile ≈ 7,150,766,259,200,000 calories

Therefore, based on the given information and calculations, we estimate that there are approximately 7,150,766,259,200,000 calories in one cubic mile of chocolate ice cream.

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Complete the following mathematical operations, rounding to the
proper number of sig figs:
a) 12500. g / 0.201 mL
b) (9.38 - 3.16) / (3.71 + 16.2)
c) (0.000738 + 1.05874) x (1.258)
d) 12500. g + 0.210

Answers

Answer: proper number of sig figs. are :

              a) 6.22 x 10⁷ g/Lb

              b) 0.312

              c) 1.33270

              d)  12500.210

a) Given: 12500. g and 0.201 mL

Let's convert the units of mL to L.= 0.000201 L (since 1 mL = 0.001 L)

Therefore,12500. g / 0.201 mL = 12500 g/0.000201 L = 6.2189055 × 10⁷ g/L

Now, since there are three significant figures in the number 0.201, there should also be three significant figures in our answer.

So the answer should be: 6.22 x 10⁷ g/Lb

b) Given: (9.38 - 3.16) / (3.71 + 16.2)

Therefore, (9.38 - 3.16) / (3.71 + 16.2) = 6.22 / 19.91

Now, since there are three significant figures in the number 9.38, there should also be three significant figures in our answer.

So, the answer should be: 0.312

c) Given: (0.000738 + 1.05874) x (1.258)

Therefore, (0.000738 + 1.05874) x (1.258) = 1.33269532

Now, since there are six significant figures in the numbers 0.000738, 1.05874, and 1.258, the answer should also have six significant figures.

So, the answer should be: 1.33270

d) Given: 12500. g + 0.210

Therefore, 12500. g + 0.210 = 12500.210

Now, since there are five significant figures in the number 12500, and three in 0.210, the answer should have three significant figures.So, the answer should be: 1.25 x 10⁴ g

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Compute the derivative of the following function.
h(x)=x+5 2 /7x² e^x

Answers

The given function is h(x) = x+5(2/7x²e^x).To compute the derivative of the given function, we will apply the product rule of differentiation.

The formula for the product rule of differentiation is given below. If f and g are two functions of x, then the product of these functions can be differentiated as shown below. d/dx [f(x)g(x)] = f(x)g'(x) + g(x)f'(x)

Using this formula for the given function, we have: h(x) = x+5(2/7x²e^x)\

h'(x) = [1.2/7x²e^x] + [x+5](2e^x/7x^3)

The derivative of the given function is h'(x) = [1.2/7x²e^x] + [x+5](2e^x/7x^3).

Therefore, the answer is: h'(x) = [1.2/7x²e^x] + [x+5](2e^x/7x^3).

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The cost of operating a Frisbee company in the first year is $10,000 plus $2 for each Frisbee. Assuming the company sells every Frisbee it makes in the first year for $7, how many Frisbees must the company sell to break even? A. 1,000 B. 1,500 C. 2,000 D. 2,500 E. 3,000

Answers

The revenue can be calculated by multiplying the selling price per Frisbee ($7) , company must sell 2000 Frisbees to break even. The answer is option C. 2000.

In the first year, a Frisbee company's operating cost is $10,000 plus $2 for each Frisbee.

The company sells each Frisbee for $7.

The number of Frisbees the company must sell to break even is the point where its revenue equals its expenses.

To determine the number of Frisbees the company must sell to break even, use the equation below:

Revenue = Expenseswhere, Revenue = Price of each Frisbee sold × Number of Frisbees sold

Expenses = Operating cost + Cost of producing each Frisbee

Using the values given in the question, we can write the equation as:

To break even, the revenue should be equal to the cost.

Therefore, we can set up the following equation:

$7 * x = $10,000 + $2 * x

Now, we can solve this equation to find the value of x:

$7 * x - $2 * x = $10,000

Simplifying:

$5 * x = $10,000

Dividing both sides by $5:

x = $10,000 / $5

x = 2,000

7x = 2x + 10000

Where x represents the number of Frisbees sold

Multiplying 7 on both sides of the equation:7x = 2x + 10000  

5x = 10000x = 2000

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