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Given independent random variables X and Y with E ( X ) =80, ox =10 and E(Y ) =85, Oy =12 respectively, find the mean and variance of each of the following random variables. a. W =4X -2Y b. {X1,..., Xjoo) and {Y1,..., Yoo) are independent draws from X and Y distributions. W = Y-X c. {X1,..., X10) are independent draws from X distributions. W = X1+ , . ..,+X10 d. W = 10X