Let XXX and YYY have joint PDF f(x,y)=2f(x, y) = 2f(x,y)=2 for 0≤x≤y≤10 \leq x \leq y \leq 10≤x≤y≤1. What is fY(y)f_Y(y)fY(y)?
fY(y)=yf_Y(y) = yfY(y)=y
fY(y)=2yf_Y(y) = 2yfY(y)=2y
fY(y)=1f_Y(y) = 1fY(y)=1
fY(y)=2f_Y(y) = 2fY(y)=2