Question

The joint pdf ofX and Y is f (x,y)=kxy

Answer 1

for $0<x<1,0<y<1$

$\int^1_0\int^1_0f(x,y)dxdy=1$

$\int^1_0\int^1_0kxydxdy=k\int^1_0(y/2)dy=k/4=1$

$k=4$