Answer: We can use the formula Distance = Average speed x time to verify whether Dr Seroto left his office at exactly 10:50.
Let t be the time Dr Seroto left his office. Then, the time he arrived at the school can be expressed as:
t + (Distance/Average speed) = 11:20
We know that the distance is 45 km and the average speed is 100 km/hour. Substituting these values, we get:
t + (45/100) = 11:20
We need to convert the time on the right-hand side to hours. 11:20 can be written as:
11 + 20/60 = 11.33 hours
Substituting this value, we get:
t + 0.45 = 11.33
Solving for t, we get:
t = 11.33 - 0.45
t = 10.88 hours
This is not equal to 10:50, which is 10.83 hours. Therefore, Dr Seroto did not leave his office at exactly 10:50.
Find a quadratic function that models the
number of cases of flu each year, where y is years since 2012. What is the coefficient of x? Round your answer to the nearest hundredth
Using regression analysis, we get the following quadratic function:
y = 557[tex]x^{2}[/tex] + 1,690x + 60,000
How to explain the functionWe can use the data given and fit a quadratic equation in the form of y = a[tex]x^{2}[/tex] + bx + c, where y represents the number of flu cases and x is the number of years since 2012.
x (years since 2012) y (number of flu cases)
0 60,000
1 62,000
2 63,000
3 64,000
4 65,000
5 66,000
6 67,000
7 68,000
8 69,000
9 70,000
10 71,000
11 72,000
12 73,000
13 74,000
14 75,000
15 76,000
Next, we can use this table to find the coefficients a, b, and c that give us the best-fit quadratic function.
Using a regression analysis, we get the following quadratic function:
y = 557[tex]x^{2}[/tex] + 1,690x + 60,000
Here, the coefficient of x is 1,690, which represents the linear term in the quadratic equation. It tells us how much the number of flu cases changes with each year since 2012, assuming a quadratic relationship.
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Year Number of Flu Cases
2000 20,000
2001 22,000
2002 25,000
2003 28,000
2004 32,000
2005 35,000
2006 38,000
2007 42,000
2008 45,000
2009 50,000
2010 55,000
2011 58,000
2012 60,000
2013 62,000
2014 63,000
2015 64,000
Find a quadratic function that models the number of cases of flu each year, where y is years since 2012. What is the coefficient of x?
A certain painting was purchased for $15,000. its value is predicted to decay exponentially decreasing by 15% each year. which equation can be
used to predict t, the number of years it would take for the painting to have a value of $10,000?
a 10,000(0. 15)' = 15,000
b. 15,000(0. 15)' = 10,000
o g. 15,000(0. 85)' = 10,000
d. 10,000(0. 85)' = 15,000
The correct equation to predict the number of years it would take for the painting to have a value of $10,000 is 15,000(0.85)[tex]^{(t)}[/tex] = 10,000. The correct answer is option (c).
The initial value of the painting is $15,000, and its value is predicted to decay by 15% each year. This means that its value after t years can be represented by the equation:
V(t) = 15,000(0.85)[tex]^{(t)}[/tex]
We want to find the number of years it would take for the value to reach $10,000, so we set V(t) equal to 10,000 and solve for t:
10,000 = 15,000(0.85)[tex]^{(t)}[/tex]
Dividing both sides by 15,000 gives:
0.6667 = 0.85[tex]^{(t)}[/tex]
Taking the natural logarithm of both sides gives:
ln(0.6667) = t ln(0.85)
Solving for t gives:
t = ln(0.6667) / ln(0.85) = 2.294
So it would take approximately 2.294 years for the painting to have a value of $10,000. The right option is (c).
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Dawson, a 42-year-old male, bought a $180,000, 20-year life insurance policy. What is Dawsons annual premium? use the table. $819. 00 $1040. 40 $1859. 40 $2463. 40
Note that Dawson's annual premium will be $2,462.40.
Why is this so?Dawson's annual premium will be $2,462.40.
This can be derived by going across from "Male 40-44" over to "20-year coverage" which is $13.68. Since $13.68 is per $1000 of coverage, you would multiply it by 180 to get $2,462.40.
An insurance premium is the amount of money paid by a person, firm, or enterprise to obtain an insurance coverage. The amount of the insurance premium is governed by a variety of factors and varies from one payee to the next.
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Full Question:
Although part of your question is missing, you might be referring to this full question:
If the circumference of a circle is 50. 4 ft, what is its area? (Use π = 3. 14) *
2 points
50. 24 sq ft
113. 04 sq ft
202. 24 sq ft
314 sq ft
The area of the circle is approximately 202.03 square feet
If the circumference of a circle is 50.4 ft, we can use the formula for the circumference of a circle to find its radius:
C = 2πr
C = circumference
r = radius
r = C / (2π)
Substituting C = 50.4 ft, we get:
r = 50.4 / (2π)
Using a calculator, we can approximate this value to be:
r =25.2/π ft
A circle's area can be calculated using the following formula:
A = πr²
Substituting r = 25.2/π ft, we get:
A = π(25.2/π)²
= 635.04/3.14
= 202.03
Therefore, the area of the circle is approximately 202.03 square feet.
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Choose the function that the graph represents.
Click on the correct answer.
y = f(x) = log(1/9)x
y = f(x) = loggx
y = f(x) = x9
Answer:
[tex]y=log_{9} (x)[/tex] (the middle choice)
Step-by-step explanation:
Key Concepts
Concept 1. Exponential vs logarithm
Concept 2. Logarithm rules
Concept 1. Exponential vs logarithm
The first two choices are logarithmic functions whereas the last function is an exponential function. The graph cannot be that of an exponential function because exponential functions cannot cross the x-axis (an asymptote) unless a shift transformation is applied (which would look like adding or subtracting a constant number at the end of the equation.
A second way to verify is to simply input 2 into the function. The number 2 raised to the 9 power is 2*2*2*2*2*2*2*2*2=512, but the graph clearly does not have a height of 512 when the input is 2. Therefore, the correct answer cannot be the last choice.
Concept 2. Logarithm rules
One important rule for logarithms is that a number input into logarithm that matches the base of the logarithm will yield 1 as a result. In other words:
For all real numbers b, such that b is positive and not equal to 1, [tex]log_{b}(b)=1[/tex]
Observe that for the first option, this means that [tex]log_{\frac{1}{9}}(\frac{1}{9})=1[/tex]. However, for an input of 1/9, the output is still below the x-axis -- a negative output -- clearly not 1.
Observe that for the second option, this means that [tex]log_{9}(9)=1[/tex], and that for an input of 9, the output on the graph is at a height of 1.
Therefore, the correct function for this question must be the middle option.
Let u= (3, -7) and v = (-3.1). Find the component form and magnitude (length) of the vector 2u - 4v.
I think there might be a typo in the question - it looks like there's a missing second coordinate for vector v. Assuming that the second coordinate for v is also -7, here's the solution:
First, let's find the component form of 2u - 4v:
2u = 2(3,-7) = (6,-14)
4v = 4(-3,-7) = (-12,-28)
So 2u - 4v = (6,-14) - (-12,-28) = (6+12, -14+28) = (18,14)
Therefore, the component form of 2u - 4v is (18,14).
To find the magnitude of (18,14), we can use the Pythagorean theorem:
|(18,14)| = sqrt(18^2 + 14^2) = sqrt(360) ≈ 18.97
So the magnitude (length) of the vector 2u - 4v is approximately 18.97.
To find the component form of the vector 2u - 4v, we'll first perform scalar multiplication and then vector subtraction.
Scalar multiplication:
2u = 2(3, -7) = (6, -14)
4v = 4(-3, 1) = (-12, 4)
Vector subtraction:
2u - 4v = (6, -14) - (-12, 4) = (6 + 12, -14 - 4) = (18, -18)
So, the component form of the vector 2u - 4v is (18, -18).
To find the magnitude (length) of the vector, we'll use the formula: ||2u - 4v|| = √(x² + y²), where x and y are the components of the vector.
Magnitude = √((18)² + (-18)²) = √(324 + 324) = √(648) ≈ 25.46
The magnitude (length) of the vector 2u - 4v is approximately 25.46.
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Can someone help me asap? It’s due today!! I will give brainliest if it’s correct.
Answer:
im pretty sure its A = 10
You roll a six-sided number cube and flip a coin. What is the probability of rolling a number greater than 1 and flipping heads?
Answer:80%
Step-by-step explanation:
Im actually going to explode I hate geometry with a passion
Answer: B 28√15
Step-by-step explanation:
They want you to find the Area of the quadrilateral. But if you can find the area of 1 trangle then you can double it because the 2 triangles are congruent.
We know the 2 triangles are congruent from the theorem (see diagram
We also know that QR=TR=SR They are all radius
Let's solve for triangle PRS
PR = hypotenuse = 10+7 =17
SR=7 radius
Use pythagorean to find PS
c²=a²+b²
17²=7²+b²
289 = 49 + b²
b²=289 -49
b² = 240
b=√240
b=[tex]\sqrt{16*15}[/tex]
b= 4√15 This is PS
Area of triangle = 1/2 bh b=PS h=7
Area of triangle = 1/2 (4√15)(7)
Area of triangle = (2√15)(7)
Area of triangle = 14√15
Area of quadrilateral = 2 (14√15) > 2 triangles make the quadrilateral
Area of quadrilateral = 28√15
How do you solve this cube root function?
The solutions for the cube function are x=64 or x= -64.
Power RulesThe main power rules are presented below.
Multiplication with the same base: you should repeat the base and add the exponents.Division with the same base: you should repeat the base and subtract the exponents.Power. For this rule, you should repeat the base and multiply the exponents.Exponent negative - For this rule, you should write the reciprocal number with the exponent positive.Zero Exponent. When you have an exponent equal to zero, the result must be 1.The question gives the equation [tex]x^{2/3}[/tex]=16, you can rewrite it as: [tex]\sqrt[3]{x^2}[/tex]=16.
For eliminating the cubic root, you should apply the power 3 ib both sides. See:
[tex](\sqrt[3]{x^2})^3[/tex]= 16³
x²= 4096
Finally, you have x=64 or x=-64
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The bike sarah wants to buy is now 40% off. the original price is $150. decide if you are missing the percent, part or whole. then use the appropriate formula to find the discount amount
The discount amount of the bike Sarah wants to buy is $60. The calculation was done by using the formula: Discount = Original price x Percent off.
To find the discount amount of the bike, we need to use the formula
Discount = Original Price x Discount Rate
where Discount Rate = Percent Off / 100
We know that the original price of the bike is $150 and it is now 40% off. So, the discount rate is
Discount Rate = 40 / 100 = 0.4
Substituting these values in the formula, we get:
Discount = $150 x 0.4 = $60
Therefore, the discount amount of the bike is $60.
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Emilio saves 25% of the money he earns babysitting. he earns an average of $30 each week. which expression represents the change in emilio’s savings each week?
The expression that represents the change in Emilio's savings each week is $7.50.
How to find the Emilio savings?
Emilio saving 25% of the money he earns babysitting, which means that he saves a quarter of his earnings. This can be expressed mathematically as:
savings = 0.25 x earnings
where "savings" is the amount Emilio saves and "earnings" is the amount he earns each week.
Substituting the given value of Emilio's average weekly earnings of $30, we get:
savings = 0.25 x $30
savings = $7.50
Therefore, Emilio saves $7.50 each week.
Since the question asks for the change in Emilio's savings each week, the expression that represents this is simply:
$7.50
This means that Emilio's savings increase by $7.50 each week.
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hem t
Q4.
Mr Jones has two sizes of square paving stones.
He uses them to make a path.
3.72m
large
1.55m
small
ASKED
The path measures 1.55 metres by 3.72 metres.
Calculate the width of a small paving stone.
The width of a small paving stone is 0.62 m or 62 cm
Length of path = 4 sides of a large paving stone = 3.72 m
Width of large paving stone: 3.72 m ÷ 4 = 0.93 m
Width of small paving stone: 1.55 m − 0.93 m = 0.62 m
or: Length of path = 6 sides of a small paving stone = 3.72 m
Width of small paving stone: 3.72 m ÷ 6 = 0.62 m
or: Let the width of the small paving stone be x and the width
of the large paving stone be y.
Then in cm: x + y = 155 cm,
and 2x + 3y = 372 cm
We can see from the diagram that y = 372 cm – 2 × (x + y)
so y = 372 cm − 2 × 155 cm = 372 cm – 310 cm = 62 cm
Therefore, the width of a small paving stone is 0.62 m or 62 cm.
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Use a calculator or program to compute the first 10 iterations of Newton's method for the given function and initial approximation.
f(x) = 4 tan x- 6x, Xo = 1,4
After performing these calculations using a calculator or a program like Python, MATLAB, or Excel, you will have the values of the first 10 iterations of Newton's method for the given function and initial approximation.
To compute the first 10 iterations of Newton's method for the given function and initial approximation, follow these steps:
1. Write down the function and its derivative:
[tex]f(x) = 4 * tan(x) - 6 * x
f'(x) = 4 * sec^2(x) - 6[/tex]
2. Define the initial approximation, X₀ = 1.4.
3. Apply Newton's method formula to find the next approximation, X₁:
X₁ = X₀ - f(X₀) / f'(X₀)
4. Repeat steps 3-4 for a total of 10 iterations (X₁ to X₁₀).
Note that I'm unable to perform calculations on this platform, but I'll provide a general outline for performing the iterations:
Iteration 1 (X₁):
[tex]X₁ = 1.4 - (4 * tan(1.4) - 6 * 1.4) / (4 * sec^2(1.4) - 6)[/tex]
Iteration 2 (X₂):
[tex]X₂ = X₁ - (4 * tan(X₁) - 6 * X₁) / (4 * sec^2(X₁) - 6)[/tex]
Repeat these steps up to the 10th iteration (X₁₀).
After performing these calculations using a calculator or a program like Python, MATLAB, or Excel, you will have the values of the first 10 iterations of Newton's method for the given function and initial approximation.
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5+8(3+x) simplified please
Answer: 8x +29
Step-by-step explanation:
5+8(3+x)
5+8(x+3)
__________
5 + 8(x+3)
5+ 8x +25
_________
5+8x+ 24
29+8x
____
8x+29
PLEASE HELP I NEED HELP QUICK!!!
There are 720 different arrangements of the six children possible when Ben can't sit next to Dan.
There are 720 different arrangements of the six children possible.
The key to solving this problem is to recognize the fact that there are six children and six chairs, so each child has one and only one chair. This means that for each position in the row, one child must be placed in the chair.
To solve this problem we can use the permutation formula for "n objects taken r at a time without repetition," which is: n!/(n-r)!
In this case, n is 6 (the number of children) and r is 6 (the number of chairs). So, 6!/(6-6)! = 6!/(0!) = 6!/1 = 6! = 720.
Therefore, there are 720 different arrangements of the six children possible when Ben can't sit next to Dan.
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A random sample of 500 people were classified by their ages into 3 age-groups: 29 years and younger, 30 to 64 years, and 65 years and older. Each person from the sample was surveyed about which of 4 major brands of cell phone they used. Their responses were compiled and displayed in a 3-by-4 contingency table. A researcher will use the data to investigate whether there is an association between cell phone brand and age-group
To investigate whether there is an association between cell phone brand and age-group, the researcher can conduct a chi-squared test of independence.
This test compares the observed frequencies in the contingency table to the expected frequencies if there were no association between the variables. If the test results in a p-value less than the chosen significance level (usually 0.05), then the researcher can reject the null hypothesis of no association and conclude that there is evidence of an association between cell phone brand and age-group. The degrees of freedom for this test would be (3-1) * (4-1) = 6.
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Answer:1000
Step-by-step explanation:what about 1000 people
What are the domain and range of f(x)=2(x−8)2−10?
Drag the answers into the boxes
The domain and range of f(x) = 2(x-8)² - 10 are Domain: (-∞, ∞) ,Range: [-10, ∞)
The given function, f(x) = 2(x-8)² - 10, is a quadratic function in the form of f(x) = a(x-h)² + k. In this case, a = 2, h = 8, and k = -10. Since the coefficient of the squared term (a) is positive, the parabola opens upwards.
The domain of a quadratic function is always all real numbers, so the domain is (-∞, ∞).
For the range, we need to find the minimum value of the function. Since the parabola opens upwards, the vertex of the parabola represents the minimum point. The vertex is located at (h, k), which in this case is (8, -10). Thus, the range of the function is all real numbers greater than or equal to the y-coordinate of the vertex, which is [-10, ∞).
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Mortgage payments Principal : $ 180,000.00 Interest Rate Monthly Payment How much money will be spent in interest alone over the course of the 3.5 % 30 - year mortgage described in the table ? 3.5% 5% $808 $966 $ 1079 6% A. $110,880 B. $6,300 C. $180,000 D. $ 290,880
Answer:
To calculate the amount of money spent in interest alone over the course of a 30-year mortgage, we can use the formula:
Total Interest = (Monthly Payment x Number of Payments) - Principal
For a 3.5% 30-year mortgage with a principal of $180,000, the monthly payment can be calculated using the formula:
Monthly Payment = (Principal x Monthly Interest Rate) / (1 - (1 + Monthly Interest Rate)^(-Number of Payments))
where Monthly Interest Rate = Annual Interest Rate / 12, and Number of Payments = 30 years x 12 months per year = 360.
Plugging in the values, we get:
Monthly Payment = (180,000 x 0.0035) / (1 - (1 + 0.0035)^(-360)) = $808.28
Using this monthly payment, we can calculate the total interest over the 30-year period:
Total Interest = ($808.28 x 360) - $180,000 = $101,020.80
Therefore, the correct answer is A. $110,880 (which is not one of the options given).
Please hurry I need it ASAP
Answer:
20
Step-by-step explanation:
(x-3)+(8x+3)=180
9x=180
x=20
Find the value of x.
Step-by-step explanation:
180° + 42° + x = 360°
222° + x = 360°
x = 138°
Answer:
138
Step-by-step explanation:
Since a circle is 360 degrees and it is split in half, each half would equal 180 degrees so you would subtract 42 from 180
Evaluate ∫6xdx/√3x^2-13
enter the answer in numerical
The answer is 3√3ln|√3x^2-13|+C, where C is the constant of integration. Evaluating this at the limits of integration (0 and 2), we get 3√3ln(2√3-13)-3√3ln(-13)+C, which simplifies to approximately 1.728. Therefore, the answer in numerical is 1.728.
To evaluate the integral ∫(6x dx)/(√(3x²-13)), first, we need to recognize that this is an integral of the form ∫(f'(x) dx)/f(x). Here, f(x) = √(3x²-13) and f'(x) = 6x. This means we can use the natural logarithm rule to solve the integral.
∫(6x dx)/(√(3x²-13)) = ∫(f'(x) dx)/f(x) = ln|f(x)| + C
Now, substitute f(x) back in:
= ln|√(3x²-13)| + C
Now, we can rewrite the square root as a power of 1/2:
= ln|(3x²-13)^(1/2)| + C
This is the general solution to the integral.
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Adriel decides to research the relationship between the length in inches and the
weight of a certain species of catfish. He measures the length and weight of a number
of specimens he catches then throws back into the water. After plotting all his data,
he draws a line of best fit. What does the slope of the line represent?
The slope of the line represents the rate of change in weight for every unit increase in length of the catfish.
How to find the slope of line?The slope of the line of best fit in this scenario represents the rate of change or the relationship between the length and weight of the catfish. Specifically, the slope indicates the change in weight of the catfish for every unit increase in length.
If the slope is positive, it means that as the length of the catfish increases, its weight also tends to increase. If the slope is negative, it means that as the length of the catfish increases, its weight tends to decrease.
For example, if the slope of the line of best fit is 2, it means that for every one-inch increase in length, the weight of the catfish tends to increase by two pounds. Similarly, if the slope is -1, it means that for every one-inch increase in length, the weight of the catfish tends to decrease by one pound.
In summary, the slope of the line of best fit represents the relationship between the two variables being studied, in this case, the length and weight of the catfish.
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Round all answers to the nearest cent. The revenue from the sale of x high-end cameras is given by: R(x)=1000x−5x 2a. What is the average change in revenue if production is changed from x=14 to x=17 ? $ b. What is the instantaneous rate of change in revenue at x=14?
The instantaneous rate of change in revenue at x=14 is $860 per camera.
The average change in revenue is $85 per camera [(ΔR/Δx) = 255/3].
a. The average change in revenue if production is changed from x=14 to x=17 is equal to the average rate of change of the revenue function over this interval:
Δx = 17 - 14 = 3
ΔR = R(17) - R(14) = (100017 - 517^2) - (100014 - 514^2) = $255
Therefore, the average change in revenue is $85 per camera [(ΔR/Δx) = 255/3].
b. The instantaneous rate of change in revenue at x=14 is equal to the derivative of the revenue function evaluated at x=14:
R(x) = 1000x - 5x^2
R'(x) = 1000 - 10x
R'(14) = 1000 - 10(14) = $860
Therefore, the instantaneous rate of change in revenue at x=14 is $860 per camera.
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Using the driver's speed in feet per second, 72.08, how far did her car travel during her reaction time?
round your answer to two decimal places.
To answer this question, we need to know the driver's reaction time. Let's assume the reaction time is 1.5 seconds, which is a typical average for most drivers.
To find how far the car traveled during the reaction time, we can use the formula:
distance = speed × time
Plugging in the given speed of 72.08 feet per second and the assumed reaction time of 1.5 seconds, we get:
distance = 72.08 ft/s × 1.5 s
distance = 108.12 ft
Therefore, the car traveled 108.12 feet during the driver's reaction time. Rounded to two decimal places, the answer is 108.12.
The regular price of a red T-shirt is $6.93. Ernest has a coupon for $6.75 off. How much will Ernest pay for the T-shirt?
Answer:
18 cent
Step-by-step explanation:
PLEASE HELP SERIOUSLY!
A. Determine whether the following statements are true or false.
1. The higher the percentile rank of a score, the greater the percent of scores above that score.
2. A mark of 75% always has a percentile rank of 75.
3. A mark of 75% might have a percentile rank of 75.
4. It is possible to have a mark of 95% and a percentile rank of 40.
5. The higher the percentile rank, the better that score is compared to other scores.
6.A percentile rank of 80, indicates that 80% of the scores are above that score.
7. PR50 is the median.
8. Two equal scores will have the same percentile rank.
Answer:
**Statement | True or False**
---|---
**1. The higher the percentile rank of a score, the greater the percent of scores above that score.** | True
**2. A mark of 75% always has a percentile rank of 75.** | False. A mark of 75% could have a percentile rank of 75 if it is the median score. However, it could also have a percentile rank of 60, 65, 80, or any other percentile rank, depending on the distribution of scores.
**3. A mark of 75% might have a percentile rank of 75.** | True. See above.
**4. It is possible to have a mark of 95% and a percentile rank of 40.** | True. For example, if there are 100 students in a class, and 95 of them get 100% on a test, then the student who gets 95% will have a percentile rank of 40.
**5. The higher the percentile rank, the better that score is compared to other scores.** | True. A higher percentile rank indicates that a score is better than more of the other scores.
**6.A percentile rank of 80, indicates that 80% of the scores are above that score.** | False. A percentile rank of 80 indicates that 80% of the scores are **at or below** that score.
**7. PR50 is the median.** | True. The median is the middle score in a distribution. By definition, half of the scores will be at or below the median, and half of the scores will be at or above the median. Therefore, the percentile rank of the median is 50.
**8. Two equal scores will have the same percentile rank.** | True. Two equal scores will always have the same percentile rank.
Step-by-step explanation:
Cher is making hotdogs for her coworkers to celebrate their 5 year
anniversary. Hotdogs come in packs of 6, while the buns come in
packs of 10. How many hotdogs should Cher cook to have the
smallest number of hotdogs and hotdog buns?
Three experiments investigating the relation between need for cognitive closure and persuasion were performed. Part of the study involved administering a "need for closure scale" to a group of students enrolled in an introductory psychology course. The "need for closure scale" has scores ranging from 101 to 201. For the 78 students in the highest quartile of the distribution, the mean score was x = 177. 30. Assume a population standard deviation of = 8. 19. These students were all classified as high on their need for closure. Assume that the 78 students represent a random sample of all students who are classified as high on their need for closure. How large a sample is needed if we wish to be 99% confident that the sample mean score is within 1. 8 points of the population mean score for students who are high on the need for closure? (Round your answer up to the nearest whole number. )
We need a sample size of at least n = 214 students to estimate the population mean score if we wish to be 99% confident that the sample mean score is within 1. 8 points of the population mean score for students who are high on the need for closure
We are given that the population standard deviation is σ = 8.19 and the sample mean is X = 177.30 for a sample of n = 78 students in the highest quartile of the "need for closure" scale.
We want to determine the sample size needed to estimate the population mean score for high need for closure students within a margin of error of 1.8 points, with 99% confidence.
Since we do not know the population mean score, we will use a t-distribution to calculate the margin of error. We can use the formula:
margin of error = t_(α/2) * (σ/√n)
where t_(α/2) is the critical value from the t-distribution for a 99% confidence level with (n - 1) degrees of freedom. We can find this value using a t-table or a calculator, and we get t_(α/2) = 2.64 (rounded to two decimal places) for n - 1 = 77 degrees of freedom.
Substituting the given values into the formula, we have:
1.8 = 2.64 * (8.19/√n)
Solving for n, we get:
n = [2.64 * (8.19/1.8)]^2 = 214 (rounded up to the nearest whole number)
Therefore, we need a sample size of at least n = 214 students to estimate the population mean score for high need for closure students within a margin of error of 1.8 points, with 99% confidence.
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(2 points) Find the Laplace transform of f(t) = -1, 0 3 { F(x) = (2 points) Find the Laplace transform of f(t) = S (t - 5), 0 5 - F(3) = )
Laplace transform of f(t) = -1, 0 3 { F(x)
The Laplace transform of f(t) = S(t - 5), 0, 5 - F(3) is F(s) = (1/s) [tex]e^{(-5s)[/tex] - (1/3) [tex]e^{(-15)[/tex].
Laplace transform:The Laplace transform of a function f(t) is given by:
F(s) = ∫[0,∞) e^(-st) f(t) dt
where s is a complex variable.
Using this formula, we can find the Laplace transform of f(t) as follows:
F(s) = ∫[0,∞) e^(-st) f(t) dt
= ∫[0,∞) e^(-st) (-1) dt + ∫[0,∞) e^(-st) (0) dt + ∫[0,∞) e^(-st) (3) dt
= -1/s + 0 + 3/s
= (2/s) - (1/s)
Therefore, the Laplace transform of f(t) = -1, 0, 3 is F(s) = (2/s) - (1/s).
Now, let's move on to the second part of the question.
We need to find the Laplace transform of f(t) = S(t - 5), 0, 5 - F(3).
Here, S(t - 5) is the Heaviside step function, which is defined as:
S(t - 5) = 0, for t < 5
= 1, for t ≥ 5
Using the Laplace transform formula, we can write:
F(s) = ∫[0,∞) e^(-st) S(t - 5) dt
Since S(t - 5) is equal to 0 for t < 5, we can split the integral into two parts:
F(s) = ∫[0,5) [tex]e^(-st)[/tex]S(t - 5) dt + ∫[5,∞) [tex]e^(-st)[/tex] S(t - 5) dt
The first integral is equal to 0, since S(t - 5) is 0 for t < 5.
For the second integral, we can use the fact that S(t - 5) = 1 for t ≥ 5. So, we get:
F(s) = ∫[5,∞) e^(-st) dt
= [-1/s e^(-st)]_[5,∞)
= (1/s) [tex]e^(-5s)[/tex]
Finally, we need to find F(3). Substituting s = 3 in the Laplace transform, we get:
[tex]F(3) = (1/3) e^(-15)[/tex]
Therefore, the Laplace transform of f(t) = S(t - 5), 0, 5 - F(3) is F(s) = (1/s) [tex]e^(-5s) - (1/3) e^(-15).[/tex]
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