Suppose that a random variable X has normal distribution with mean µ = 2 and variance σ 2 = 9, that is, X ∼ N(2, 9).   (30) E[(X + 2)^2 ] is   (a) 20   (b) 25   (c) 15   (d) 30   (31) The variance of X/2 + 3 is   (a) 9/4   (b) 3/8   (c) 9   (d) 9/2

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