Busy Phone Lines. Refer to the probability distribution displayed in the table in Problem 18. a. Find
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Busy Phone Lines. Refer to the probability distribution displayed in the table in Problem 18.
a. Find the mean of the random variable Y.
b. On average, how many lines are busy?
c. Compute the standard deviation of Y.
d. Construct a probability histogram for Y ; locate the mean; and show one-, two-, and three-standard-deviation intervals.
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