The time in seconds that it takes a librarian to locate an entry in a file of records on checked-out
Question: 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 an expected time of 20 seconds. (5 points)
a. What is the probability that the time is less than 30 seconds? (2)
b. What is the probability that the time is more than 20 seconds? (3)
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