The common stock of US Air Inc. had annual returns of 15.6 %, 2.4 % , -11.8 % and 32.9% over the past 4 years respectively. What is the standard deviation of these returns.?
a. 13.29 percent
b. 14.14 percent
c. 16.50 percent
d. 17.78 percent
e. 19.05 percent
to calculate std. dev, we first need the mean (for simplicity, i will omit the % sign for now, so 15.6% is just 15.6, I will add it back later)
mean = ...
The expert examines standard deviation for common stock of the United States Air Inc.