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3 chuán qí xiǎo cǎo dǎ bù sǐ pinuin op-|||-zài wǒ guó yún nán de xī shuāng bǎn n
3 chuán qí xiǎo cǎo dǎ bù sǐ pinuin op-|||-zài wǒ guó yún nán de xī shuāng bǎn n
设随机变量X，Y，Z相互独立，且X～N(1，2)，Y～N(2，2)，Z～N(3，7)，记a=P(X＜Y)，b=P(Y＜Z)，则有______A. a＞bB. a
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