An investment produced annual rates of return of 7%, -14%, 20% and 4% respectively over the past four years. What is the standard deviation of these returns?
A) 12.1%
B) 14.0%
C) 1.5%
D) 7.0%

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The Answer of An investment produced annual rates of return of 7%, -14%, 20% and 4% respectively over the past four years. What is the standard deviation of these returns?
A) 12.1%
B) 14.0%
C) 1.5%
D) 7.0%

An Investment Produced Annual Rates of Return of 7%, -14