Show Instructions Question 6 3 pts The average annual return over the period 1926-2019 for the S&P 500 is 12.0%, and the standard deviation of returns is 21.3%. Based on these numbers, what is a 95% confidence interval for 2020 returns? 0 -1.5%, 21.8% -30.6%, 54.6% O-10,7%, 32.8% O-30.6%. 76.4%