Six years ago, you purchased 450 shares of common stock for $34.25 per share. Since that time, the annual returns were 4.3%,(2.9%),7.8%,(1.1%),8.9%, and 3.8%, Based on these annual returns, calculate the stock's standard deviation and the range of returns within which you'd expect the annual return to be within 95% of the time.
a. (8.37%) to 15.93%
b. (14.66%) to 20.33%
c. (12.84%) to 17.81%
d. (15.25%) to 21.08%
e. (5.94% ) to 12.87%