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A company had annual returns of 18 percent,-3 percent, 11percent, and 14percent over the past 4 years. What is the standard deviation of the returns

A company had annual returns of 18 percent,-3 percent, 11percent, and 14percent over the past 4 years. What is the standard deviation of the returns for this period?
A8.42
B 9.13
C9.58
d10.07
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