If Y is a continuous random variable with density function f (y) that is symmetric about

Chapter 4, Problem 4.37

(choose chapter or problem)

If Y is a continuous random variable with density function f (y) that is symmetric about 0 (that is, f (y) = f (y) for all y) and E(Y ) exists, show that E(Y ) = 0. [Hint: E(Y ) = # 0 y f (y) dy + # 0 y f (y) dy. Make the change of variable w = y in the first integral.]

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