# Question

With reference to Exercise 3.62 on page 91, find the expected value of U = X + Y + Z.

## Answer to relevant Questions

If the probability distribution of X is given by f(x) = (1/2)x for x = 1, 2, 3, . . . show that E(2X) does not exist. This is the famous Petersburg paradox, according to which a player’s expectation is infinite (does not ...Prove Theorem 4.7. Theorem 4.7 If X has the variance σ2, Then var(aX + b) = a2σ2 Show that if X is a random variable with the mean µ for which f(x) = 0 for x < 0, then for any positive constant a, P(X ≥ a) ≤ µ/a This inequality is called Markov’s inequality, and we have given it here mainly ...With reference to Exercise 4.37, find the variance of the random variable by In exercise (a) Expanding the moment-generating function as an infinite series and reading off the necessary coefficients; (b) Using Theorem 4.9. If the joint probability density of X and Y is given by Find the variance of W = 3X + 4Y – 5.Post your question

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