美军过后的战乱图片:X is a random variable with E(x) = 1.5 and σ = 0.8,E(7-4X+2X^2) =_______(specify with 2 digits)
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有关概率的英文题
E7 - 4EX + 2(EX^2) = 4.22
EX^2 = (EX)^2 - σ^2 =
X is a random variable with E(x) = 1.5 and σ = 0.8,E(7-4X+2X^2) =_______(specify with 2 digits)
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