Question: 90. Let X have a Poisson distribution with parameter . Show that E(X) directly from the definition of expected value. [Hint: The first

90. Let X have a Poisson distribution with parameter . Show that E(X) directly from the definition of expected value. [Hint: The first term in the sum equals 0, and then x can be canceled. Now factor out and show that what is left sums to 1.]

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