X y and z are independent normally distributed random
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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