求解概率论题 设(x,y)的联合密度函数为f(x,y)={6x²y,0<=x<=1...答:fY(y)=∫(-∞,+∞)f(x,y)dx=2y, 0<=y<=1,其他为0 (2)f(x,y)=fX(x)fY(y)所以,x,y独立 (3)P(x>y)=∫∫(-∞,+∞)f(x,y)dxdy 积分区域为x>y =∫(0,1)∫(0,x)f(x,y)dydx=3/5 (4)F(x,y)= ∫∫(-∞,+∞)f(x,y)dxdy ,x<0,或者y<0,F(x...
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