Consider Review Exercise 2.117 on page 97. The random
Chapter , Problem 2.99(choose chapter or problem)
Consider Review Exercise 2.117 on page 97. The random variables X and Y represent the number of vehicles that arrive at two separate street corners during a certain 2-minute period in the day. The joint distribution is f(x, y) = 1 4(x+y) 9 16 , for x = 0, 1, 2,... and y = 0, 1, 2,... . (a) Give E(X), E(Y ), Var(X), and Var(Y ). (b) Consider Z = X + Y , the sum of the two. Find E(Z) and Var(Z).
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