Assume that the length of a phone call in minutes is an


Assume that the length of a phone call in minutes is an Exponential random variable with parameter λ = 1 / 10

A. Compute the Cumulative Distribution Function.

If a disrespectful person arrives immediately ahead of you at a public telephone, compute the probability in which you will have to wait:

B. More than 10 minutes.

C. Between 10 and 20 minutes.

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