# Expected value and variance

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The number of winter storms in a good year is Poisson random variable with mean 3, whereas the number in a bad year is a Poisson random variable with mean 5. If next year will be a good year with probability 0.4 or a bad year with probability 0.6, find the expected value and variance of the number of storms that will occur.

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#### Solution Summary

This shows how to find the expected value and variance with a Poisson distribution.

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