Question: how to calculate Variance and SD from this data? Standard Date Adj Close Return SPY Variance Deviation begin{tabular}{|rrr|} hline 1/1/2018 & 257.83771 & -0.036360

how to calculate Variance and SD from this data?
how to calculate Variance and SD from this data? Standard Date Adj

Standard Date Adj Close Return SPY Variance Deviation \begin{tabular}{|rrr|} \hline 1/1/2018 & 257.83771 & -0.036360 \\ \hline/1/2018 & 248.46266 & -0.031291 \\ \hline 3/1/2018 & 240.68814 & 0.009194 \\ \hline//1/2018 & 242.90106 & 0.024309 \\ \hline 5/1/2018 & 248.80574 & 0.001255 \\ 6/1/2018 & 249.118 & 0.041703 \\ 7/1/2018 & 259.50705 & 0.031919 \\ \hline/1/2018 & 267.79038 & 0.001412 \\ \hline/1/2018 & 268.16858 & -0.064890 \\ 10/1/2018 & 250.76706 & 0.018549 \\ 11/1/2018 & 255.41855 & -0.093343 \\ 12/1/2018 & 231.57704 & 0.086373 \\ 1/1/2019 & 251.57904 & 0.032416 \\ 2/1/2019 & 259.73416 & 0.013636 \\ 3/1/2019 & 263.27579 & 0.045437 \end{tabular}

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