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【单选题】
设随机变量(X，Y)服从二维正态分布，且X与Y不相关f X (x)，f Y (y)分别表示X，Y的概率密度，则在Y=y条件下，X的条件概率密度f X｜Y (x｜y)为( )A.
f\r\n X \r\n(x)。
B.
f\r\n Y \r\n(y)。
C.
f\r\n X \r\n(x)f\r\n Y \r\n(y)。
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【简答题】完成实例47,48
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