A stock had annual returns of 9 percent,−16 percent,14 percent,and 2 percent over the past 4 years.What is the standard deviation of these returns?

Name: A stock had annual returns of 9 percent,−16 percent,14 percent,and 2 percent over the past 4 years.What is the standard deviation of these returns?
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Quizplus · Accepted Answer

Mean = (0.09 − 0.16 + 0.14 + 0.02)/ 4 = .0225 σ = {[(0.09 − 0.0225)² + (−0.16 − 0.0225)² + (0.14 − 0.0225)² + (0.02 − 0.0225)²] / (4 − 1)}^.5 = 0.1312,or 13.12%

A Stock Had Annual Returns of 9 Percent,−16 Percent,14 Percent,and