3 1 6 LM07 Group Discussion The S&P 500 (referred to simply as the S&P) is a stock market index that measures the stock performance of 500 large companies listed on stock exchanges in the United States. It is one of the most commonly followed equity indices The S&P annual return on investments including dividends) for five years was as follows: 2015: 1.38% 2016: 11.77% 2017: 21.61% 2018: 4.23% 2019: 31.22% (1) Using the above returns, what is the average return, the variance, and the standard deviation