Sports and Leisure
Suppose the number of rides that a visitor enjoyed at Disney World during a day is a random variable with probability distribution given in the table below.
|
x
|
5
|
6
|
7
|
8
|
9
|
10
|
11
|
12
|
|
P(x)
|
0.04
|
0.07
|
0.09
|
0.12
|
0.20
|
0.30
|
0.13
|
0.05
|
a. Find the mean number of rides for a Disney World visitor.
b. Find the variance and standard deviation of the number of rides for a Disney World visitor.
c. Find the probability that the number of rides for a randomly selected Disney World visitor is within one standard deviation of the mean. Write a Solution Trail for this problem.
d. Find the probability that the number of rides for a randomly selected Disney World visitor is less than one standard deviation above the mean.