The number of winter storms in a good year is aPoisson

Chapter 7, Problem 7.65

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The number of winter storms in a good year is aPoisson random variable with mean 3, whereas thenumber in a bad year is a Poisson random variablewith mean 5. If next year will be a good year withprobability .4 or a bad year with probability .6, findthe expected value and variance of the number ofstorms that will occur.

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