assume that large-company stocks had an average return of 12.1 percent and a standard deviation of 19.6 percent for a 40-year period. what range of returns would you expect to see on these stocks 95 percent of the time? multiple choice -30.3 percent to 53.2 percent -30.3 percent to 73.9 percent -30.3 percent to 64.1 percent -27.1 percent to 53.2 percent -27.1 percent to 51.3 percent