A supplier of kerosene has a weekly demand Y possessing a probability density function given by f(y) = {y, 0 ≤ y ≤ 1; 1, 1 < y ≤ 1.5; 0, elsewhere, with measurements in hundreds of gallons. (This problem was introduced in Exercise 4.13.) The supplier's profit is given by U = 10Y - 4. a Find the probability density function for U. b Use the answer to part (a) to find E(U).