The common stock of Air Express had annual returns of 11.7 percent, 8.8 percent, 16.7 percent, and −7.9 percent over the last four years, respectively. What is the standard deviation of these returns?
A) 8.29 percent
B) 9.14 percent
C) 11.54 percent
D) 7.78 percent
E) 10.66 percent

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The Answer of The common stock of Air Express had annual returns of 11.7 percent, 8.8 percent, 16.7 percent, and −7.9 percent over the last four years, respectively. What is the standard deviation of these returns?
A) 8.29 percent
B) 9.14 percent
C) 11.54 percent
D) 7.78 percent
E) 10.66 percent

The Common Stock of Air Express Had Annual Returns of 11.7