Problem: A stock produced returns of 11%, -14%, and 3% over three of the past four years. The arithmetic average for the past four years is 6.5%.
Required:
Question: What is the standard deviation of the stock's returns for this four year period? Please show steps how you get an answer and please be clear in your explanation.
a. 10.67%
b. 18.34%
c. 16.66%
d. 14.43%
e. 8.33%