5. Suppose X and Y are random variables with E(X) = 15, var(X) = 4, E(Y) = 25, var(Y) = 3 What are the expected value an

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5 Suppose X And Y Are Random Variables With E X 15 Var X 4 E Y 25 Var Y 3 What Are The Expected Value An 1 (30.68 KiB) Viewed 102 times

5. Suppose X and Y are random variables with E(X) = 15, var(X) = 4, E(Y) = 25, var(Y) = 3 What are the expected value and variance of the random variable X + Y? a E(X + Y) = 20, var(X + Y) = 7 b. E(X + Y) = 40, var(X + Y) = 3.5 c. E(X + Y) = 40, var(X + Y) = 5 d. E(X + Y) = 40, var(X + Y) = 7 e. There is insufficient information to answer this question 6. A mortgage company advertises that 85 percent of applications are approved. In a random sample of 30 applications, what is the expected number that will be turned down? a. 30(0.85) b. 30(0.15) c. 30(0.85)(0.15) d. 30(0.85)(15) (0.85 (0.15) 30 e.