Show that the following function satisfies the properties of a joint probability mass function. xyfxy(x, y) −1.0 −2 1/8 −0.5 −1 1/4 0.5 1 1/2 1.0 2 1/8 determine the following: a. p(x < 0.5, y < 1.5) b. p(x < 0.5) c. p(y < 1.5) d. p(x > 0.25, y < 4.5) e. e(x), e(y), v(x), v(y) f. marginal probability distribution of x