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% Same facts as above: what is the standard deviation of the returns? 1.77% 13.30% 20.57% 8.12%