PassageBased on the above data, answer the given subquestions. The joint density of two continuous random variables XX and YY is given as fXY(x,y)=e−(x+y)f_{XY}(x,y)=e^{-(x+y)} for 0≤x<∞0\le x<\infty, 0≤y<∞0\le y<\infty, and 00 otherwise.