Question: Suppose that X is a negative binomial random variable with p _ 0.2 and r _ 4. Determine the following: (a) E(X1) (b) P(X =20)

Suppose that X is a negative binomial random variable with p _ 0.2 and r _ 4. Determine the following:
(a) E(X1)
(b) P(X =20)
(c) P(X =19)
(d) P(X =21)
(e) The most likely value for X

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