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The waiting period from the time a book is ordered until it is received is a...

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Statistics

The waiting period from the time a book is ordered until it isreceived is a random variable with the mean value 7 days and thestandard deviation 2 days. If Helen wants to be 95% sure that shereceives a book by the certain date, how many days in advanceshould she order the book. Hint: Use Chebyshev’s inequality.

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