Salaries for teachers in a particular elementary school district are normally distributed with a mean of $44,000 and a standard deviation of $6500. We randomly survey 10 teachers from that district.
In words,
In words,
In words,
Find the probability that the teachers earn a total of over $400,000.
Find the 90th percentile for an individual teacher’s salary.
Find the 90th percentile for the average teachers’ salary.
If we surveyed 70 teachers instead of 10, graphically, how would that change the distribution for
?
If each of the 70 teachers received a $3000 raise, graphically, how would that change the distribution for
?
0.9742
$52,330
$46,634
The distribution of income in some Third World countries is considered wedge shaped (many very poor people, very few middle income people, and few to many wealthy people). Suppose we pick a country with a wedge distribution. Let the average salary be $2000 per year with a standard deviation of $8000. We randomly survey 1000 residents of that country.
In words,
In words,
How is it possible for the standard deviation to be greater than the average?
Why is it more likely that the average of the 1000 residents will be from $2000 to $2100 than from $2100 to $2200?
The average length of a maternity stay in a U.S. hospital is said to be 2.4 days with a standard deviation of 0.9 days. We randomly survey 80 women who recently bore children in a U.S. hospital.
In words,
In words,
In words,
Is it likely that an individual stayed more than 5 days in the hospital? Why or why not?
Is it likely that the average stay for the 80 women was more than 5 days? Why or why not?
Which is more likely:
an individual stayed more than 5 days; or
the average stay of 80 women was more than 5 days?
If we were to sum up the women’s stays, is it likely that, collectively they spent more than a year in the hospital? Why or why not?
Individual
In 1940 the average size of a U.S. farm was 174 acres. Let’s say that the standard deviation was 55 acres. Suppose we randomly survey 38 farmers from 1940. (Source: U.S. Dept. of Agriculture)
In words,
In words,
The IQR for
is from _______ acres to _______ acres.
The stock closing prices of 35 U.S. semiconductor manufacturers are given below. (Source:
Wall Street Journal )
8.625
30.25
27.625
46.75
32.875
18.25
5
0.125
2.9375
6.875
28.25
24.25
21
1.5
30.25
71
43.5
49.25
2.5625
31
16.5
9.5
18.5
18
9
10.5
16.625
1.25
18
12.875
7
12.875
2.875
60.25
29.25
In words,
Construct a histogram of the distribution of the averages. Start at
. Make bar widths of 10.
In words, describe the distribution of stock prices.
Randomly average 5 stock prices together. (Use a random number generator.) Continue averaging 5 pieces together until you have 10 averages. List those 10 averages.
Use the 10 averages from (e) to calculate:
Construct a histogram of the distribution of the averages. Start at
. Make bar widths of 10.
Does this histogram look like the graph in (c)?
In 1 - 2 complete sentences, explain why the graphs either look the same or look different?
Based upon the theory of the Central Limit Theorem,
$20.71; $17.31; 35
Exponential distribution,
~
$20.71; $11.14
Questions & Answers
A golfer on a fairway is 70 m away from the green, which sits below the level of the fairway by 20 m. If the golfer hits the ball at an angle of 40° with an initial speed of 20 m/s, how close to the green does she come?
A mouse of mass 200 g falls 100 m down a vertical mine shaft and lands at the bottom with a speed of 8.0 m/s. During its fall, how much work is done on the mouse by air resistance
Chemistry is a branch of science that deals with the study of matter,it composition,it structure and the changes it undergoes
Adjei
please, I'm a physics student and I need help in physics
Adjanou
chemistry could also be understood like the sexual attraction/repulsion of the male and female elements. the reaction varies depending on the energy differences of each given gender. + masculine -female.
Pedro
A ball is thrown straight up.it passes a 2.0m high window 7.50 m off the ground on it path up and takes 1.30 s to go past the window.what was the ball initial velocity
2. A sled plus passenger with total mass 50 kg is pulled 20 m across the snow (0.20) at constant velocity by a force directed 25° above the horizontal. Calculate (a) the work of the applied force, (b) the work of friction, and (c) the total work.
you have been hired as an espert witness in a court case involving an automobile accident. the accident involved car A of mass 1500kg which crashed into stationary car B of mass 1100kg. the driver of car A applied his brakes 15 m before he skidded and crashed into car B. after the collision, car A s
can someone explain to me, an ignorant high school student, why the trend of the graph doesn't follow the fact that the higher frequency a sound wave is, the more power it is, hence, making me think the phons output would follow this general trend?
Nevermind i just realied that the graph is the phons output for a person with normal hearing and not just the phons output of the sound waves power, I should read the entire thing next time
Joseph
Follow up question, does anyone know where I can find a graph that accuretly depicts the actual relative "power" output of sound over its frequency instead of just humans hearing
Joseph
"Generation of electrical energy from sound energy | IEEE Conference Publication | IEEE Xplore" ***ieeexplore.ieee.org/document/7150687?reload=true
A string is 3.00 m long with a mass of 5.00 g. The string is held taut with a tension of 500.00 N applied to the string. A pulse is sent down the string. How long does it take the pulse to travel the 3.00 m of the string?
