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Homework Help: Method of Moment Generating Function Help

  1. Feb 24, 2012 #1
    Let X1 be a binomial random variable with n1 trials and p1 = 0.2 and X2 be an independent
    binomial random variable with n2 trials and p2 = 0.8. Find the probability function of
    Y = X1 + n2 – X2.
    Exactly how does one calculate the mgf of (n2 - X2)?
  2. jcsd
  3. Feb 24, 2012 #2

    Ray Vickson

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    Homework Helper

    If X2 counts the number of successes, what does n2 - X2 count?

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