You find a certain stock that had returns of 20 percent, -16 percent, 22 percent, and 16 percent for four of the last five years. The average return of the stock over this period was 12.16 percent. (Do not round intermediate calculations and round your final answer to 2 decimal places. (e.g., 32.16)) What was the stock's return for the missing year? Stock's return What is the standard deviation of the stock's returns? Standard deviation