Please look at the attached file and answer the following questions.

1. Did I calculate the Returns correctly?

2. Please teach me how to calculate the covariance from the figures on the Excel.

Please show me the examples.

3. Please teach me how to calculate the variance from the figures on the Excel.

Please show me the examples.

Monthly 6 years Date Open High Low Close Returns 2023/5/1 102.41 103.91 89.89 91.82 2023/4/1 100.21 102.56 96.46 102.5 2023/3/1 100.13 99.19 102.7 90.46 108.5 118.18 98.96 99.61 2023/2/1 2023/1/1 88.98 110.58 87.83 108.49 2022/12/1 97.87 99.69 84.07 86.88 2022/11/1 107.7 108.84 86.28 97.87 2022/10/1 95.73 107.43 90.71 106.54 94.28 94.33 112.08 2022/9/1 111.79 117.49 2022/8/1 104.87 126.48 103.86 2022/7/1 94.24 106.34 90.23 106.1 2022/6/1 112.01 112.85 92.01 2022/5/1 111.71 116.44 99.47 2022/4/1 137.34 94.4 110.44 139.26 111.36 111.63 daily 3 years weekly 3 years monthly_6 years Adj Close Volume -10.42% 91.82 252,120,500 2.37% 102.5 156,601,900 0.52% 100.13 196,622,800 -8.19% 99.61 252,908,500 24.87% 108.49 228,917,500 -11.23% 86.88 301,451,500 -8.14% 97.87 427,693,700 12.94% 106.54 180,462,300 -15.84% 94.33 209,868,200 5.64% 112.08 294,112,900 12.39% 106.1 196,472,800 -14.52% 94.4 241,396,000 -1.07% 323,011,400 -18.61% 274,453,400 + 110.44 111.63