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Question 891:

X, Y, and Z are independent normally distributed random variables. The following information is known about these three variables:

E (X) =4, Var (X)=10,
E (Y)=-5, Var (Y)=6,
E(Z)=3, Var(Z)=2.

Let W= 2X-Y+3Z,

Find Var(W)

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