Q 3[3+7]: Let Y and Y2 denote the lengths of life, in hundreds of hours, for components of types I and II, respectively, in an electronic system. The joint density of Y, and Y is (1/8)/2 e (+)/2 for >0.12>0 elsewhere The cost C of replacing the two components depends upon their lengths of life at the failure and is given by C50+4Y+2Y. Find E(C) and V(C).