The United States Postal Service reports 95% of first-class mail within the same city are delivered within

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The United States Postal Service reports 95% 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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Related Book For  book-img-for-question

Basic Statistics For Business And Economics

ISBN: 9780073521473

8th Edition

Authors: Douglas Lind, William Marchal, Samuel Wathen

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