Ten annual returns are listed in the following table. 3 5 6 10 -19.9% 16.5% 19% -50% 43.2% 1.1% -16.4% -45.5% 45.3% -2% (a) What is the average annual return over the ten-year period (as a percent)? (b) What is the standard deviation of annual returns over the ten-year period (as a percent)? (Round your answer to two decimal places.) (c) What is the 95% confidence interval on the return of this stock next year (as a percent) if the past average returns and volatility of returns are unbiased estimators of expected returns and future volatility. (Round your answers to two decimal places.) % to %