Textbook ExpertVerified Tutor
13 Nov 2021
Given information
Suppose that the length of long-distance phone calls, measured in minutes, is known to have an exponential distribution with the average length of a call equal to eight minutes.
Step-by-step explanation
Step 1.
The required probability can be calculated as follows:
Therefore, the probability that a phone call lasts more than nine minutes is
.
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