If 95% confidence interval based on this sample is: 0.9 hours to 2.7 hours, the sample mean (x') is estimated to be 1.8 hours.
The sample mean (x;) is not explicitly given in the information provided. However, we can infer it from the 95% confidence interval.
A 95% confidence interval is typically constructed using the sample mean and the margin of error. The interval provided (0.9 hours to 2.7 hours) represents the range within which we are 95% confident the true population mean lies.
To find the sample mean, we take the midpoint of the confidence interval. In this case, the midpoint is (0.9 + 2.7) / 2 = 1.8 hours.
The 95% confidence interval indicates that, based on the sample data, we are 95% confident that the true mean time all high school students study for Geometry tests falls between 0.9 hours and 2.7 hours, with the estimated sample mean being 1.8 hours.
To learn more about sample mean click on,
https://brainly.com/question/15201212
#SPJ4
Find the deflection u (x, y, t) satisfying the wave equation utt = 4 (uxx + Uyy) for a rect- = angular plate with fixed ends and dimensions: horizontal a = 2pi and vertical b initial velocity is g(x, y) = 0 The initial displacement is f(x, y) = - 3sin(5x) * sin(6y) + 11sin(6x) * sin(9y)
TheThe general solution to the wave equation utt = 4 (uxx + Uyy) is given by the D’Alembert’s formula. Therefore, the solution to the given problem is obtained by finding the specific form of the initial conditions u (x, y, 0) = f (x, y) and ut (x, y, 0) = g (x, y) and then use these values to find u (x, y, t) using the D’Alembert’s formula.
Let us find the form of the wave u(x,y,t) that satisfies the wave equation utt = 4 (uxx + Uyy) given the initial displacement f(x,y) = -3sin(5x)sin(6y) + 11sin(6x)sin(9y) and g(x,y) = 0.
Solution:
The D’Alembert’s formula for the wave equation is given by:
`u(x,y,t) = (1/2) [f(x+ct,y) + f(x-ct,y)] + (1/(2c)) ∫_((x-ct))^(x+ct)∫_((y-c(t-s)))^(y+c(t-s)) g(s,r) dr ds`
where c is the speed of the wave. Comparing with the wave equation `utt = c^2(uxx + uyy)` we have `c = 2`
Therefore, the solution to the wave equation is given by:
`u(x,y,t) = (1/2) [-3sin(5(x+2t))sin(6y) -3sin(5(x-2t))sin(6y) +11sin(6(x+2t))sin(9y) +11sin(6(x-2t))sin(9y)]`
Hence, the solution is:
`u(x,y,t) = (1/2) [-3sin(5(x+2t))sin(6y) -3sin(5(x-2t))sin(6y) +11sin(6(x+2t))sin(9y) +11sin(6(x-2t))sin(9y)]`
So, this is the required solution.
Can anyone help me pls ? ( it’s talking about the blue dot ) will give brainliest!!
Answer:
NO
Step-by-step explanation:
From the graph attached,
Equation of the line parallel to x-axis is y = 3.
Since, the line is dotted line, equation will be an inequality (having sign of < or >)
Now shaded region is below the line so equation of the inequality will be,
y < 3
Any point below the dotted line will be the solution of the given inequality.
Therefore, blue dot on the dotted line represented by y = 3 will not be the solution of the inequality.
Answer is NO.
Can someone please help me on this and show work if you can? Thanks!
Answer:
area = 18.81 m²
Step-by-step explanation:
solving for the 7 sided polygon first:
divide into 7 equal isosceles triangles, each having sides of 10 m and a peak angle of 360°/7 = 51.43°. Drop a line from the peak & perpendicular to the base makes a right triangle with a 25.71° peak angle and a 10 m hypotenuse.
sin 25.71° = x/10, x = 4.34, the base of the full triangle will be 2 x 4.34 = 8.68 m
cos 25.71° = x/10, x = 9.01, the rise of the triangle is 9.01 m
The area of each triangle will be 1/2(8.68)(9.01) = 39.10 m²
39.10 x 7 triangles = 273.72 m²
area of 7 sided polygon = 273.72 m²
Next solve for the inner circle:
The rise of the triangle (9.01) is the radius of the inner circle.
area of inner circle = πr² = 3.14(9.01²) = 254.91 m²
273.72 - 254.91 = 18.81 m²
STRESSING OUT ABOUT THIS ONE
I had this one before. I'm pretty sure it is 1.61
Answer:
1.61
Step-by-step explanation:
It just makes since.
A new car is valued at $28,000. It increases 9% per year. What is the total value of the car two year after purchase?
Answer:
$33,040
Step-by-step explanation:
Hope this helps and have a wonderful day!!!
Answer:
$30520
Step-by-step explanation:
A vending machine dispenses coffee into a twenty-ounce cup. The amount of coffee dispensed into the cup is normally distributed with a standard deviation of 0.03 ounce. You can allow the cup to overfill 4% of the time. What amount should you set as the mean amount of coffee to be dispensed? Click to view page 1 of the table. Click to view page 2 of the table. 19.9 ounces
The mean amount of coffee to be dispensed should be set at μ + 0.0525 ounce, where μ represents the original mean amount of coffee. This ensures that the cup overfills only 4% of the time.
To determine the mean amount of coffee to be dispensed, we need to find the value that corresponds to the 96th percentile of the normal distribution. This value represents the amount of coffee that should not be exceeded 96% of the time.
Using a standard normal distribution table or a calculator, we find that the z-score corresponding to the 96th percentile is approximately 1.75.
Since the standard deviation is given as 0.03 ounce, we can set up the equation:
1.75 = (x - μ) / 0.03
Solving for x, the mean amount of coffee to be dispensed, we get:
x - μ = 1.75 * 0.03
x - μ = 0.0525
x = μ + 0.0525
Therefore, the mean amount of coffee to be dispensed should be set at μ + 0.0525 ounce to ensure that the cup overfills only 4% of the time.
To know more about mean refer here:
https://brainly.com/question/31101410#
#SPJ11
Janice wants to go to the Sadie Hawkins dance. The probability of a random boy saying yes is 45%. How many does she need to be willing to ask to have a 99.7% chance of going?
Janice needs to be willing to ask at least 16 boys to have a 99.7% chance of getting a "yes" and going to the Sadie Hawkins dance.
To determine how many boys Janice needs to be willing to ask in order to have a 99.7% chance of getting a "yes" and going to the Sadie Hawkins dance, we can use the concept of probability and the binomial distribution.
The probability of a random boy saying yes is 45%, which means the probability of a boy saying no is 55%. Let's assume Janice asks "n" boys.
The probability of at least one boy saying yes can be calculated using the complement rule. The complement of the event "at least one boy saying yes" is the event "all boys saying no."
The probability of all "n" boys saying no is (0.55)^n, as the probability of each boy saying no is 55%.
To find the number of boys Janice needs to ask to have a 99.7% chance of going, we want the complement probability (all boys saying no) to be 0.003. Therefore:
(0.55)^n ≤ 0.003
Taking the logarithm of both sides:
n * log(0.55) ≤ log(0.003)
Solving for "n":
n ≥ log(0.003) / log(0.55)
Using a calculator:
n ≥ 15.154
Since Janice can't ask a fraction of a boy, we need to round up the value of "n" to the nearest whole number.
Therefore, Janice needs to be willing to ask at least 16 boys to have a 99.7% chance of getting a "yes" and going to the Sadie Hawkins dance.
For more questions on chance
https://brainly.com/question/29580949
#SPJ8
You are interested in estimating the mean age of the citizens living in your community. In order to do this, you plan on constructing a confidence interval; however, you are not sure how many citizens should be included in the sample. If you want your sample estimate to be within 3 years of the actual mean with a confidence level of 98%, how many citizens should be included in your sample? Assume that the standard deviation of the ages of all the citizens in this community is 22 years.
71 citizens should be included in the sample to estimate the mean age of the citizens living in your community at a 98% level of confidence.
We need to find out the sample size of citizens that should be included in the sample to estimate the mean age of the citizens living in your community at a 98% level of confidence.
The formula for the Margin of error is
E: E = Zc/2 * (σ/√n)
Where E is the margin of error Zc/2 is the Z-value for the level of confidence cσ is the population standard deviation is the sample size.
So the formula for the sample size n is: n = (Zc/2 / E)² * σ²
We have Zc/2 = Z0.02/2 = Z0.01 = 2.33 (using z-table) σ = 22 years
E = 3 years
n = (2.33 / 3)² * 22²
n ≈ 70.36 ≈ 71 (rounded up)
Therefore, 71 citizens should be included in the sample to estimate the mean age of the citizens living in your community at a 98% level of confidence.
To know more about the margin of error visit:
https://brainly.in/question/53362907
#SPJ11
The measure of ∠CBD is 45% of the measure of ∠ABC. Find the value of x.
Answer:
x = 49.5°
Step-by-step explanation:
∠ABC = 90°
∠CBD = 45%∠ABC
∠CBD = 0.45(90)
∠CBD = 40.5°
x = ∠ABC - ∠CBD
x = 90 - 40.5
x = 49.5°
A cruise ship heads due west from a port 3 miles directly south of San Francisco. If the ship is travelling at a constant rate of 17 mph, how fast is the distance between the ship and San Francisco changing 1 hour after leaving port? Round your answer to the nearest tenth.
If the ship is travelling at a constant rate of 17 mph, the distance between the ship and San Francisco is changing at a rate of approximately 1 mile per hour. So, the rate of change is 1mph.
What is the concept of related rates?
The concept of related rates is a fundamental topic in calculus that deals with how the rates of change of different variables are related to each other. It involves analyzing how the rates of change of two or more related quantities are connected through their derivatives.
To solve this problem, we can use the concept of related rates. Let's assume that the cruise ship starts at point A, the port 3 miles directly south of San Francisco, and moves towards the west.
Let's denote the position of the cruise ship at a given time as point B. We are interested in finding the rate at which the distance between point B and San Francisco (let's call it point C) is changing.
We can create a right triangle with points A, B, and C, where the distance between A and C is the constant 3 miles. Let's call the distance between B and C as "x" (in miles).
We are given that the ship is traveling at a constant rate of 17 mph, which means its speed is 17 miles per hour.
To find how fast the distance between the ship and San Francisco is changing, we need to find dx/dt (the rate at which "x" is changing) when 1 hour has passed.
Using the Pythagorean theorem, we have:
[tex]x^2 + 3^2 = (distance\ traveled \ by\ the\ ship)^2[/tex]
Taking the derivative of both sides with respect to time (t):
2x(dx/dt) = 2(distance traveled by the ship)(speed of the ship)
Plugging in the given values:
2x(dx/dt) = 2(17 mph)
Simplifying:
x(dx/dt) = 17 mph
Now, we need to find x when 1 hour has passed. The ship is traveling at a constant speed of 17 mph for 1 hour, so the distance it travels is 17 miles.
Plugging in x = 17 and solving for dx/dt:
17(dx/dt) = 17 mph
dx/dt = 1 mph
Therefore, 1 hour after leaving port, the distance between the ship and San Francisco is changing at a rate of approximately 1 mile per hour.
To know more about rate of change, refer here:
https://brainly.com/question/29679479
#SPJ4
An online store sold a gift basket at five different prices and recorded the number of gift baskets that were sold at each price. The results are shown in the scatterplot.
Complete question :
An online store sold a gift basket at five different prices and recorded the number of gift baskets that were sold at each price. The results are shown in the scatterplot.
Which statement is correct based on the scatterplot?
There is no relationship between price and gift baskets sold because the points do not form a straight line.
There is no relationship between price and gift baskets sold because there are multiple prices at which 80 gift baskets were sold.
There is a relationship between price and gift baskets sold, and the relationship is that as the price increases, the gift baskets sold increases.
There is a relationship between price and gift baskets sold, and the relationship is that as the price increases, the gift baskets sold decreases.
Answer:
There is a relationship between price and gift baskets sold, and the relationship is that as the price increases, the gift baskets sold decreases.
Step-by-step explanation:
From the scatterplot provided, it could be observed thatbthere is a linear trend in the plot created. This shows that there is a relationship between the price of gifts and the number if gift basket sold.
Furthermore, the slope of the linear trend line that could be drawn from the plotted data is negative, A negative slope Indicates a negative relationship, that is an increase in x leads to corresponding decrease in y. He ce, as price increases the number sold decreases
Answer:
d and/ or the other dude
Step-by-step explanation:
The following estimated regression equation is based on 10 observations was presented. ŷ 29.1270 +0.5906x1 + 0.4980x2 = Here SST = 6,589.125, SSR = 6,282.500, sb₁ = 0.0808, and $₂ = 0.0603. a. Compute MSR and MSE (to 3 decimals). MSR = MSE = b. Compute F and perform the appropriate F test (to 2 decimals). Use a = 0.05. Use the F table. F = The p-value is Select your answer At a = 0.05, the overall model is - Select your answer c. Perform a t test for the significance of B₁ (to 2 decimals). Use a = 0.05. Use the t table. tB₁ = The p-value is - Select your answer - At a = 0.05, there is - Select your answer ✓ relationship between y and 1. d. Perform a t test for the significance of B₂ (to 2 decimals). Use a = 0.05. Use the t table. tB₂ = d. Perform a t test for the significance of B₂ (to 2 decimals). Use a = 0.05. Use the t table. tB₂ = The p-value is - Select your answer At a = 0.05, there is - Select your answer - ✓relationship between y and X2.
There is a significant relationship between y and both x1 and x2.
MSR = 306.625, MSE = 30.844b. F = 9.939 and p-value = 0.007. At a = 0.05, the overall model is significant.
tB₁ = 7.301 and p-value = 0.0009. At a = 0.05, there is a significant relationship between y and x1. d. tB₂ = 4.771 and p-value = 0.0008. At a = 0.05, there is a significant relationship between y and x2.
In a regression model, the F-test is used to determine whether the regression coefficient as a whole is statistically significant or not.
The p-value of the F-test is compared to the significance level (α) to determine statistical significance.
If the p-value is less than α, the regression coefficient as a whole is considered statistically significant. If it is greater than α, then it is not statistically significant.
t-test is used to determine whether each individual regression coefficient is statistically significant or not.
The p-value of the t-test is compared to the significance level (α) to determine statistical significance.
If the p-value is less than α, the regression coefficient is considered statistically significant.
If it is greater than α, then it is not statistically significant.
In this question, the F-test is significant at a = 0.05, and the t-test for both x1 and x2 is significant at a = 0.05.
Therefore, there is a significant relationship between y and both x1 and x2.
Know more about t-test here:
https://brainly.com/question/1189751
#SPJ11
The scores earned in a flower-growing competition are represented in the stem-and-leaf plot.
2 0, 1, 3, 5, 7
3 2, 5, 7, 9
4
5 1
6 5
Key: 2|7 means 27
What is the appropriate measure of variability for the data shown, and what is its value?
The IQR is the best measure of variability, and it equals 16.
The range is the best measure of variability, and it equals 45.
The IQR is the best measure of variability, and it equals 45.
The range is the best measure of variability, and it equals 16.
The appropriate measure of variability for the given data is the IQR, and its value is 16.
Based on the given stem-and-leaf plot, which represents the scores earned in a flower-growing competition, we can determine the appropriate measure of variability for the data.
The stem-and-leaf plot shows the individual scores, and to measure the spread or variability of the data, we have two commonly used measures: the range and the interquartile range (IQR).
The range is calculated by subtracting the smallest value from the largest value in the dataset. In this case, the smallest value is 20, and the largest value is 65. Therefore, the range is 65 - 20 = 45.
The interquartile range (IQR) is a measure of the spread of the middle 50% of the data. It is calculated by subtracting the first quartile (Q1) from the third quartile (Q3). Looking at the stem-and-leaf plot, we can identify the quartiles. The first quartile (Q1) is 25, and the third quartile (Q3) is 41. Therefore, the IQR is 41 - 25 = 16.
In this case, both the range and the IQR are measures of variability, but the IQR is generally preferred when there are potential outliers in the data. It focuses on the central portion of the dataset and is less affected by extreme values. Therefore, the appropriate measure of variability for the given data is the IQR, and its value is 16.
For more questions on variability
https://brainly.com/question/14544205
#SPJ8
[48 (72-12) -225] ÷ 9
someone pls help
Answer:
295
Step-by-step explanation:
Answer:
295!
Step-by-step explanation:
72 - 12 = 60
48 x 60 = 2880
2880 - 225 = 2655
2655 / 9 = 295
Have you ever heard of PEMDAS? It is the order in which to solve equations like this one. Here's what it stands for:
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction
I hope this is helpful for future math equations similar to this one.
Find the distance between the set of points (-4,5) and (4,0)
Answer:
√89
Step-by-step explanation:
√(4+4)2+(0-5)2
√(8)2+(-5)2
√64+25
√89
Help with these will give brainliest
Answer:
$ 45,600
Step-by-step explanation:
what is the degree form for 3π/4 radians? enter your answer in the box.
The degree form for 3π/4 radians is 135°.The degree form for 3π/4 radians is 135°. To convert radians to degrees, we multiply the radian measure by the conversion factor of 180°/π.
In this case, we have (3π/4) * (180°/π) = (3 * 180°) / 4 = 540° / 4 = 135°. Therefore, 3π/4 radians is equivalent to 135° in the degree form.
To convert an angle from radians to degrees, we use the conversion factor of 180°/π. This conversion factor represents the relationship between a full circle (360°) and 2π radians.
In this case, we want to convert the angle 3π/4 radians to degrees. We multiply the radian measure (3π/4) by the conversion factor (180°/π):
(3π/4) * (180°/π) = (3 * 180°) / 4 = 540° / 4 = 135°
By canceling out the common factor of π and simplifying the expression, we find that 3π/4 radians is equal to 135°.
Therefore, the degree form of the angle 3π/4 radians is 135°.
Learn more about angle here:
https://brainly.com/question/25716982
#SPJ11
3. Savannah estimates that her dog weights 30
pounds. When she takes her dog to the vet for
his check-up, the dog is placed on the scale and
actually weights 32.5 pounds. What was
Savannah's percent of error of her estimate?
Round to the nearest percent.
Answer:
8%
Step-by-step explanation:
I Need Answers Quick
Answer:
42.78cm2
Step-by-step explanation:
Area =100°/360 * 22/7 * 7^2
=42.78cm2
HELP I NEED HELP ASAP
HELP I NEED HELP ASAP HELP I NEED HELP ASAP
HELP I NEED HELP ASAP HELP I NEED HELP ASAP
HELP I NEED HELP ASAP
Answer:
i think the answer would be A
find the slope of the points 2,8 and 12,55
Answer:
m = 4.7
Step-by-step explanation:
If you plug in these values in the slope formula, this is what happens:)
Answer:
47/10x
**Do not leave your answer as a decimal, slope is usually in fraction form**
Step-by-step explanation:
Slope Formula: [tex]\frac{\text{rise}}{\text{run}} / \frac{y_2 - y_1}{x_2 - x_1}[/tex] In this formula, subtract the 1st coordinate from the second. So, the 2nd y coordinate goes first, place a "minus" sign, and then the 2nd y-coordinate. This is the same for the x coordinates.
Finding the Answer: To find the answer, we just plug the numbers correctly into the equation, just as I explained above. We would do 55-8 first, which is 47, and then 12-2 which is 10.
Combined, the answer is 47/10x. You always place an x after the slope, which can be used to plug in other numbers. The answer cannot be simplified anymore, so this is simplfied.
The temperature at sunrise is 40°F. Each hour, the temperature rises 4°F. Write an equation that models the temperature y, in degrees Fahrenheit, after x hours. What is the graph of the equation?
Write an equation that models the temperature y, in degrees Fahrenheit, after x hours.
Answer:
y = 4x + 40
Step-by-step explanation:
At sunrise, 0 hours have passed, meaning x = 0.
When x = 0, the temperature is 40, meaning that 40 is the y-intercept.
And every x hours the temperature rises by 4 degrees F
I suckkk at math.. Help?
Answer:
B. x=6
Step-by-step explanation:
substitute -7 into 2y to get -14. your new equation should be 4x-14=10. add 14 to both sides to get 4x=24, divide both sides by 4 to get x=6.
Answer:
B. 6
Step-by-step explanation:
y = -7
4x + 2(-7) = 10
4x + (-14) = 10
4x = 10 - (-14)
4x = 24
x = 6
Two number cubes are rolled.
What is the probability that the first lands on an odd number and the second lands
on an even number?
Simplify your fraction.
O / 을
0 O
3
Answer:
cubes have 6 numbers
3 odd, 3 even
Step-by-step explanation:
probablity=desiredoutcome/totalpossibleoutcomes
there are 6 total desired outcomes (3 on each cube)
total possible, there are 6*6 or 36 total possible outcomes
so 6/36 or 1/6 chance
The temperature at the point (x, y, z) in a substance with conductivity
K = 7.5 is u(x, y, z) = 3y² + 3z².
Find the rate of heat flow inward across the cylindrical surface
y² + z² = 6, 0 ≤ x ≤ 3
The integration is ∫∫(q · dS) = ∫[0 to √6] ∫[0 to √6] (-45y - 45z) dy dz.
The rate of heat flow inward across the cylindrical surface y² + z² = 6, 0 ≤ x ≤ 3 can be determined by calculating the flux of the heat vector field through the surface.
To find the rate of heat flow, we need to calculate the surface integral of the heat flux vector across the given cylindrical surface. The heat flux vector is given by q = -K∇u, where K is the conductivity and ∇u is the gradient of the temperature function u(x, y, z).
First, we find the gradient of u:
∇u = (∂u/∂x)i + (∂u/∂y)j + (∂u/∂z)k
= 0i + (6y)j + (6z)k
Then, we calculate the heat flux vector:
q = -K(∇u)
= -7.5(0i + (6y)j + (6z)k)
= -45yj - 45zk
Next, we calculate the surface area element vector, dS, of the cylindrical surface. Since the surface is defined by y² + z² = 6, we can parameterize it as r(y,z) = yi + zk. Taking the cross product of the partial derivatives, we obtain dS = (∂r/∂y) x (∂r/∂z) dy dz = (-j -k) dy dz.
Finally, we can calculate the surface integral by integrating the dot product of q and dS over the given cylindrical surface:
∫∫(q · dS) = ∫∫(-45yj - 45zk) · (-j -k) dy dz
To find the limits of integration, we note that the surface extends from y² + z² = 6 to the origin, which corresponds to 0 ≤ y² + z² ≤ 6. Since the surface is symmetric, we can integrate over a quarter of the surface, from y = 0 to y = √6 and z = 0 to z = √6.
Performing the integration, we get:
∫∫(q · dS) = ∫[0 to √6] ∫[0 to √6] (-45y - 45z) dy dz
Evaluating this double integral will give us the rate of heat flow inward across the cylindrical surface.
Learn more about integration here
https://brainly.com/question/988162
#SPJ11
In a diving meet, you score 8.4 and 7.88.
What is your total score?
Answer: 16.28?
Step-by-step explanation:
20 points helppppppppppppppppppppppppppppp
PLZZ anyone solve this ASAP
Answer:
[tex] cos^{-1}(cos\frac{ 7π}{6})=cos^{-1}(cos\frac{7*180}{6})[/tex]
[tex] cos^{-1}(cos{210})[/tex]
[tex] cos^{-}(cos(180+30))[/tex]
[since in third quadrant cos 30=-[tex] \frac{\sqrt{3}}{2}][/tex]
[tex] cos^{-}(- \frac{\sqrt{3}}{2})[/tex]
:150°or [tex] \frac{5π}{6}[/tex]
150°or [tex] \frac{5π}{6}[/tex]is a required answer.
Timothy wanted to get some exercise. He walked 12 blocks in 10 minutes. What was his average speed of his walk?
Answer: 1.2 blocks
Step-by-step explanation:
Timothy walks 12 blocks in 10 minutes so it can be written as
12 blocks = 10 minutes
divide both sides by 10
1.2 blocks per minute
13. Which graph best represents -5y = -6x + 15?
А
Help ASAP !!!
Solve 3(2x - 7)<4x - 8
Answer:
x < 6.5
Step-by-step explanation:
3(2x - 7) < 4x - 8
6x - 21 < 4x - 8
6x - 4x < -8 + 21
2x < 13
x < 6.5