# The United States Postal Service

Can you please give a DETAILED explanation to how you arrived at the answer to this problem?

The United States Postal Service reports 95 percent of first class mail within the same city are delivered within two days of the time of mailing. Six letters are randomly sent to different locations.

a. What is the probability that all six arrive within two days?

b. What is the probability that exactly five arrive within two days?

c. Find the mean number of letters that will arrive within two days.

d. Compute the variance and standard deviation of the number that will arrive within two days.

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Can you please give a DETAILED explaination to how you arrived at the answer to this problem.

The United States Postal Service reports 95 percent of first class mail within the same city

is delivered within two ...

#### Solution Summary

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