Over the past 4 years an investment returned 18%,−9%,−12%,and 15%.What is the standard deviation of returns?
A) 9.2%
B) 10.36%
C) 11.2%
D) 13.6%

Name: Over the past 4 years an investment returned 18%,−9%,−12%,and 15%.What is the standard deviation of returns? A) 9.2% B) 10.36% C) 11.2% D) 13.6%
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Question

Quizplus · Accepted Answer

Mean = (18% − 9 − 12 + 15) / 4 = 3%Variance = {[18 − 3]² + [−9 − 3)² + [−12 − 3)² + [15 − 3)]²} / 4 = 184.5Std dev = 184.5^0.5 = 13.6%

Over the Past 4 Years an Investment Returned 18%,−9%,−12%,and 15