Question: For a negative binomial random variable whose pdf is given by Equation 4.5.1, find E(X) directly by evaluating p r (1 p) kr .

For a negative binomial random variable whose pdf is given by Equation 4.5.1, find E(X) directly by evaluating 00 (1> k-1 -1. k=r pr(1 − p)k−r.

00 (1> k-1 -1. k=r

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