The U.S. Postal Service reports 95% of first-class mail within the same city is delivered within 2

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The U.S. Postal Service reports 95% of first-class mail within the same city is delivered within 2 days of the time of mailing. Six letters are randomly sent to different locations.

a. What is the probability that all six arrive within 2 days?

b. What is the probability that exactly five arrive within 2 days?

c. Find the mean number of letters that will arrive within 2 days.

d. Compute the variance and standard deviation of the number that will arrive within 2 days.

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Statistical Techniques in Business and Economics

ISBN: 978-0078020520

16th edition

Authors: Douglas Lind, William Marchal

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Question Posted: Dec 10, 2014 11:49 AM

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The U.S. Postal Service reports 95% of first-class mail within the same city is delivered within 2

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Statistical Techniques in Business and Economics

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