Please solve this problem in Microsoft Excel and showcase the formulas to get the answers. Thank you.

6. Calculating Returns and Variability You find a certain stock that had returns of 12 percent, -21 percent, 9 percent, and 32 percent for four of the last five years. If the average return of the stock over this period was 11 percent, what was the stock's return for the missing year? What is the standard deviation of the stock's returns