Negative binomial random variable
Suppose that X is a negative binomial random variable with p = 0.4 and r = 4. Determine the following.
Round your answers to four decimal places (e.g. 98.7654).
(a) E(X)
(b) P(X = 20)
(c) P(X = 19)
(d) P(X = 21)
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