Question: Calculate a historical standard deviation (S.D.) (Remember to use T-1 for the denominator) for a stock that had the following returns: 2018: -0.02 2019: 0.20

Calculate a historical standard deviation (S.D.) (Remember to use T-1 for the denominator) for a stock that had the following returns: 2018: -0.02 2019: 0.20 2020: 0.09 2021: 0.20 Please use at least 5 decimal places

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