2. A small book store orders copies of a computer magazine each week. Let Y = demand for the magazine, with pmf y 1 2 3 4 p(y) 0.2 0.3 0.4 a. What is the expected value of 10Y + 1, E(10Y + 1) ? b. What is the variance of 10Y + 1, V(10Y + 1)