You own a stock with an average return of 15 percent and a standard deviation of 15 percent. In any one given year, you have a 68 percent chance that you will not lose more than _____ percent nor earn more than ____ percent on this stock. Select one: a. -27.8; 57.0 b. -42.4;57.0 c. -38.4; 42.6 d. -25.2; 48.2 e. 0; 30