An investment produced annual rates of return of 5%, 12%, 8% and 11% respectively over the past four years. What is the standard deviation of these returns?
A) 2.7%
B) 3.2%
C) 3.6%
D) 3.8%

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The Answer of An investment produced annual rates of return of 5%, 12%, 8% and 11% respectively over the past four years. What is the standard deviation of these returns?
A) 2.7%
B) 3.2%
C) 3.6%
D) 3.8%

An Investment Produced Annual Rates of Return of 5%, 12