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The time (in seconds) that it takes a librarian to locate an entry in a file of records on checked-out books has an exponential distribution

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The time (in seconds) that it takes a librarian to locate an entry in a file of records on checked-out books has an exponential distribution with 1 =.05. In the long run, what proportion of the time will you have to wait more than the average wait time? -X X re

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