Computing variance and standard deviation

Reference no: EM1317095

The United States Postal Service report 95 percent of first class mail within the same city is 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 in two days.

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

Reference no: EM1317095

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