2019-04-26 23:35发布
本题解答过程如下：
ρ ＝ Cov(X,Y)/[D(X)D(Y)]^0.5Cov(X,Y) = ρ[D(X)D(Y)]^0.5 = 0.6X4X5= 12
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本题解答过程如下：
ρ ＝ Cov(X,Y)/[D(X)D(Y)]^0.5
Cov(X,Y) = ρ[D(X)D(Y)]^0.5
= 0.6X4X5
= 12
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