7-4. Expected Return-Discrete Distribution A stock's return has the following distribution: Demand for the Probability of this Rate of Return if This Company's Products Demand Occurring Demand Occurs Weak 0.1 (30)% Below average 0.2 (5) Average 10 Above average 0.2 Strong 0.1 40 0.4 16 1.0 Calculate the stock's expected return, standard deviation, and coefficient of variation