Let X and Y be continuous random variables having joint density function c(x2 +y2). 05x1, osys1 f (x.y) = 0 . otherwise Find cersity function c(x2+ y2), 05x51, 0sys1 f ( x, y ) = , otherwise Findp Y), x20,yzo f (x,y) = 0 , otherwise be the joint density function of X and Y. Find E (X + Y)Let (+) x>0,y20 f ( x, y ) = 0 otherwise be the joint density function of X and Y. Find V (X + Y)