Question: The random variable X is the crew size of a randomly selected shuttle mission between April 1981 and July 2000. Its probability distribution is as

The random variable X is the crew size of a randomly selected shuttle mission between April 1981 and July 2000. Its probability is as follows.

a. Find and interpret the mean of the random variable.
b. Obtain the standard deviation of the random variable by using one of the formulas given in Definition 5.10 on page 219.
c. Draw a probability histogram for the random variable; locate the mean; and show one-, two-, and three-standard-deviation intervals.

3 P(X 0.042 0.010 0.021 0.375 0.188 0.344 0.021

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