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Find the probability that a phone call lasts

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Reference no: EM132856588

Suppose that the length of cell phone calls, measured in minutes, is known to have an exponential distribution with the average length of a call equal to five minutes.

a. Define the random variable.

b. What are μ and σ?

c. Find the probability that a phone call lasts more than 7 minutes.

Reference no: EM132856588

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