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 河南成教 / 概率论与数理统计
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[单选题] 设F(x),f(y)分别是两个随机变量的分布函数,F(X),F(Y)是相应的分布密度，则下列说法中正确的是



A.F(X)-F(Y)
是某随机变量的分布函数

B.F(X)F(Y)是某随机


C.F(X)+F(Y)是某随机变量的分布密度


D.F(X)F(Y)是某随机变量的分布密度
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概率论与数理统计
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