Chapter 5: Q.5.1 (page 316)
Consider the function for . Draw the graph of and find .
Short Answer
The graph of the is

The value of thewill be
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Chapter 5: Q.5.1 (page 316)
Consider the function for . Draw the graph of and find .
The graph of the is

The value of thewill be
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Use the following information to answer the next eleven exercises. The age of cars in the staff parking lot of a suburban college is uniformly distributed from six months (0.5 years) to 9.5 years. Find the average age of the cars in the lot.
The data that follow are the square footage (in 1,000 feet squared) of 28 homes.

The sample mean = 2.50 and the sample standard deviation = 0.8302. The distribution can be written as .
What is ?
The time (in years) after reaching age that it takes an individual to retire is approximately exponentially distributed with a mean of about five years. Suppose we randomly pick one retired individual. We are interested in the time after age
to retirement.
a. Define the random variable.
b. Is continuous or discrete?
c.
d.
e.
f. Draw a graph of the probability distribution. Label the axes.
g. Find the probability that the person retired after age .
h. Do more people retire before age or after age ?
i. In a room of people over age , how many do you expect will NOT have retired yet?
Births are approximately uniformly distributed between the 52 weeks of the year. They can be said to follow a uniform distribution from one to 53 (spread of 52 weeks).
a. X ~ _________
b. Graph the probability distribution.
c. f(x) = _________
d. ì = _________
e. ó = _________
f. Find the probability that a person is born at the exact moment week 19 starts. That is, find P(x = 19) = _________
g. P(2 < x < 31) = _________
h. Find the probability that a person is born after week 40.
i. P(12 < x|x < 28) = _________
j. Find the 70th percentile.
k. Find the minimum for the upper quarter
A random number generator picks a number from one to nine in a uniform manner.
a. X ~ _________
b. Graph the probability distribution.
c. f(x) = _________
d. μ = _________
e. σ = _________
f. P(3.5 < x < 7.25) = _________
g. P(x > 5.67)
h. P(x > 5|x > 3) = _________
i. Find the 90th percentile
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