1
(X,Y)的联合
概率密度为
f(x,y)=1/2,0<=x<=2,0<=y<=1
0,其他
P(X<=Y)=∫∫X<=Y f(x,y)dxdy=(1/2)∫∫dxdy=(1/2)(矩形G中满足X<=Y的面积)=1/4
P(x>Y)=∫∫X>Y f(x,y)dxdy=1/2(矩形G中满足X>Y的面积)=3/4
同理
P(X<=2Y)=1/2
P(X>2Y)=1/2
所以联合分布为
P(u=0,V=0)=P(X<=Y)*P(X<=2Y)=1/8
P(u=0,V=1)=P(X<=Y)*P(X>2Y)=1/8
P(u=1,V=0)=P(x>Y)*P(X<=2Y)=3/8
P(u=1,V=1)=P(x>Y)*P(X>2Y)=3/8