You find a certain stock that had returns of 12.4 percent, 21.2 percent, 27.2 percent, and 18.2 percent for four of the last five years. Assume the average return of the stock over this period was 10.4 percent. What was the stocks return for the missing year? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) Stock's return 15.5 % What is the standard deviation of the stocks returns? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) Standard deviation