已知二维随机变量(X,Y)的联合概率密度函数为f(x,y)={4xy,0≤x≤1,0≤y≤1 ;0,其他.求P(X=Y)
为什么会等于0,应该用什么方法啊
人气:130 ℃ 时间:2019-08-18 11:37:26
解答
两个连续随机变量相等的概率一定是0
∫(0~1)∫(y~y) f(x,y) dxdy
∫(0~1)∫(x~x) f(x,y) dydx
都是0
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