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X1, X2, and X3 are mutually independent. They each have a mean of 12 and variance of 3. The weighted average is : A =

X1, X2, and X3 are mutually independent. They each have a mean of 12 and variance of 3. The weighted average is :

A=41X1+42X2+41X3

Find the mean of A and variance of A.

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