Mr. Watkins is at a train station, waiting to make a phone

Chapter , Problem 9

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Mr. Watkins is at a train station, waiting to make a phone call. There is only one public telephone booth, and it is being used by someone. Another person ahead of Mr. Watkins is also waiting to call. If the duration of each telephone call is an exponential random variable with = 1/8, find the probability that Mr. Watkins should wait at least 12 minutes before being able to call.

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