3.2-2. Telephone calls arrive at a doctor's office according to a Poisson process on the average of two every three minutes. Let X denote the waiting time until the first call that arrives after 10 A.M. a. What is the pdf of X? b. Find P(X> 2).

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Q: 3.2-3. Let X have an exponential distribution with mean > 0. Show that P(X > x+y|X > x) = P(X > y).

A:

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