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

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

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orchestra answered 11 months ago

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