9. Let X be a random variable with a moment generating function of the form 'What is the variance of X ? (A)0 (B) 1 (C) (D) (E)

5. Consider two independent random variables X1 and X2 with Poisson distribution: Which of the following statements is wrong? (A) The mean of Xi is λi (B) The variance of Xi is 1/ λi (C) The moment generating function of Xi is(D) X1 + X2 is Poisson distributed (E) None of these