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Let a and b be two independent normal random variables E(a) = -2 , V (a)...

Let a and b be two independent normal random variables
E(a) = -2 , V (a) = 4 , E(b)= 3, V(b) = 9.
(1) E(3a – 2b) =
(b) Var (3a – 2b) =
(c) Prob(-15 < 3a – 2b < -12) =
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