8. Let X have a negative binomial distribution with r and P-0.6. If the mean of X is 5 then r equal a. 1.8 b. 0.83 c. 3 d. 9 e. None Assume that X has an exponential distribution. If Var (4-4)=20. Then E(X) is a. 20 b.0 c. 5 d. 10 e. None 10. The variable X has a unifa

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