Suppose that the waiting time for the first customer to enter a retail shop after 9:00 A.M. is a random variable Y with an exponential density function given by () y > 0, f(y) = 0, elsewhere. a. Derive the moment-generating function of Y. b. Derive E(Y) and V(Y) using the answer in part a.

Q: (-14) + (–7)

A:

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A: