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Calculate a historical standard deviation (S.D.) (Remember to use t-1 for the denominator) for a stock that had the following returns: 2018: -0.16 2019: 0.13

Calculate a historical standard deviation (S.D.) (Remember to use t-1 for the denominator) for a stock that had the following returns:

2018: -0.16

2019: 0.13

2020: 0.23

2021: 0.16

(Please use at least 5 decimal places and do not use $ symbol in the answer)

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