Question: If the return on stock A in year 1 was 9 %, in year 2 was 8 %, in year 3 was -10 % and

If the return on stock A in year 1 was 9 %, in year 2 was 8 %, in year 3 was -10 % and in year 4 was 1 %, what was the standard deviation of returns for stock A over this four year period?

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