Let X denote the diameter of an armored electric cable and Y denote the diameter of the ceramic mold that makes the cable. Both X and Y are scaled so that they range between 0 and 1. Suppose that X and Y have the joint density f(x, y) = { b if 0 < x < y < 1 0 otherwise Find E(X). 1. E(X) - [ = = II. E(X) = [ 1 dydz y 1 = 1 dy 1 1 - y dz = v 1/1 dy dz = III. E(X) = x y IV. E(X) = = L = L = 1 y y dy dr OIV 01 O III