The last four years of roturns for a slock are as follows: a. What is the average annual return? b. What is the variance of the stock's returns? c. What is the standard deviation of the stock's retums? a. What is the average annual relum? The average rotum is N. (Round to fwo decimal places.) b. What is the variance of the stock's returns? The variance of the retums is (Round to five decimal places) c. What is the standard deviation of the stock's retums? The standard deviation is 6. (Round to two decimal places)