Question: Suppose random variable x takes on the value of -1 or 1, each with probability of 1/2. Let y=X1+X2+X3+X4, where x1,....,x4 are independent. (a)Find E(Y);

Suppose random variable x takes on the value of -1 or 1, each with probability of 1/2. Let y=X1+X2+X3+X4, where x1,....,x4 are independent. (a)Find E(Y); (b) Find Var(Y)

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