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已知D(X)=4，D(y)=9，Cov(X+y)=2，则D(3X-2Y)等于().
分类: 数学2 (军队文职)
发布时间: 2023-11-03 09:28
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已知D(X)=4，D(y)=9，Cov(X+y)=2，则D(3X-2Y)等于().
A.96
B.72
C.48
D.36
正确答案是C
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