The joint density of the future lifetimes of two machine parts is given by f(:c,y) = cw, 0

Question The joint density of the future lifetimes of two machine parts is given by f(c, y) = cc, 0 < c < y < 1, 0 elsewhere . Calculate the covariance of the two lifetimes. Possible Answers -0.025 -0.01 0.025 0.05 0.10