An appliance dealer sells three different models of upright freezers having 13.5, 15.9, and 19.1 cubic feet of storage space, respectively. let x = the amount of storage space purchased by the next customer to buy a freezer. suppose that x has the following pmf. x 13.5 15.9 19.1p(x) 0.17 0.55 0.28(a) compute e(x), e(x2), and v(x). (round your answers to two decimal places.)e(x) =e(x2) =v(x) =