Let's say you invested in WXYZ Corp. beginning in 2018, and that the firm's return was 3% in 2018 , 9% in 2019,11% in 2020,21% in 2021 . Then what is the variance of the returns? 13.30% 6.54% 1.77% 3.12% Question 6 2.5 pts Same facts as above: what is the standard deviation of the returns? 1.77% 13.30% 20.57% 8.12% Same facts as above: what is the 99% profitability range (i.e. the 99% confidence interval) of WXYZ Corp.'s returns? [28.82%,39.82%] [20.58%,31.58%] [7.80%,18.80%] We do not have sufficient information to answer this question. Question 8 2.5 pts Same facts as above: what is the geometric average of WXYZ Corp.'s returns from 2018 to 2021 ? 5.50% 5.32% 4.86% 4.53\%