The last four years of returns for a share are as follows: Year 4 1 -3.6% 2 27.8% 3 12.1% Return 4.3% a. What is the average annual return? b. What is the variance of the share's returns? c. What is the standard deviation of the share's returns? Note: Enter your answers for the average return and standard deviation as percentages. For the variance, enter your answer as a decimal number. a. The average return is %. (Enter your response as a percent rounded to two decimal places.) b. The variance of the returns is (Round to five decimal places.) c. The standard deviation is (Enter your response as a percent rounded to two decimal places.)