# Question

Given the moment- generating function MX(t) = e3t+ 8t2 , find the moment- generating function of the random variable Z = 1/4 (X – 3), and use it to determine the mean and the variance of Z.

## Answer to relevant Questions

If X and Y have the joint probability distribution f(x, y) = 14 for x = - 3 and y = - 5, x = –1 and y = –1, x = 1 and y = 1, and x = 3 and y = 5, find cov( X, Y). For k random variables X1, X2, . . . , Xk, the values of their joint moment- generating function are given by E(et1X1+ t2X2+ · · · + tkXk) (a) Show for either the discrete case or the continuous case that the partial ...With reference to Example 3.22 on page 94, and part (b) of Exercise 3.78 on page 100, find the expected value of X22X3 given X1 = 1/2. With reference to Exercise 3.101 on page 108, find E(PS), the expected receipts for the commodity. A quarter is bent so that the probabilities of heads and tails are 0.40 and 0.60. If it is tossed twice, what is the covariance of Z, the number of heads obtained on the first toss, and W, the total number of heads obtained ...Post your question

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