Three statistically independent random variables X₁, X₂ and X₂ have mean values X₁ =3, X₂ = 6 and X₂ = -2. Find the mean values of the following functions: g(X₁, X₂, X3)= X₁ +3X₂ +4X3 (a) (b) g(X₁, X₂, X₂)X₁X₂X₂

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