Let's say you invested in WXYZ Corp. beginning in 2018 , and that the firm's return was. 6% in 2018 , 11% in 2019,15% in 2020,24% in 2021 , Then what is the variance of the returns? 2.63% 2.92% 1.95% 3.19% Same facts as above: what is the standard deviation of the returns? 15.82% 14.92% 16.22% 2.63% Same facts as above: what is the 95% profitability range (i.e. the 95% confidence interval) of WXYZ Corp.'s returns? [9.72%,22.72%] [25.29%,38.29%] [35.34%,48.34%] [15.12%,20.92%] Same facts as above: what is the geometric average of WXYZ Corp.'s returns from 2018 to 2021 ? 6.12% 5.53% 6.50% 7.12%