The last four years of returns for a stock are as shown here:

a. What is the average annual return?

b. What is the variance of the stock's returns?

c. What is the standard deviation of the stock's returns?

(Click

on the icon located on the top-right corner of the data table below in order to copy its contents into a

spreadsheet.)

Year	1	2	3	4
Return	4.0%	+28.0%	+12.0%	+4.0%