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  1. F

    Poisson distribution

    Hi, I need some help here. Let N be P(λ)-distributed and X|N = n be Bin(n,p)-distributed. Find E(X) and V(X).
  2. F

    Moment generating function

    Would be thankful if someone could help me out here. The moment generating function for the exponential distributed random variable Y is mY(t) = 1/(1-Bt). What is E(Y^3)?