56. Data indicate that the number of traffic accidents in Berkeley on a rainy day is a...

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56. Data indicate that the number of traffic accidents in Berkeley on a rainy day is a Poisson random variable with mean 9, whereas on a dry day it is a Poisson random variable with mean 3. Let X denote the number of traffic accidents tomorrow. If it will rain tomorrow with probability 0.6, find

(a) E[X];

(b) P{X = 0};

(c) Var(X).

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