Question: please help Find the standard deviation for a security that has three one-year returns of 5%,9%, and 20% respectively. 8.53% 14.73% 10.23% 12.28% 7,10%

please help
please help Find the standard deviation for a security that has three

Find the standard deviation for a security that has three one-year returns of 5%,9%, and 20% respectively. 8.53% 14.73% 10.23% 12.28% 7,10%

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