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Let X ~ Poi()). Which of the following must be true? O a. E(X2) = 272 Ob. Var (X) > E(x2) Oc. E ( X2

Let X ~ Poi()). Which of the following must be true? O a. E(X2) = 272 Ob. Var (X) > E(x2) Oc. E ( X2 ) = 12 O d. E(X2) = 1 + 72

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