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

a. What is the average annual return?

The average return is________% (Round to two decimal places.)

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

The variance of the returns is__________ (Round to five decimal places.)

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

The standard deviation is_______% (Round to two decimal places.)

(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 Return 1 - 4.2% 2 + 28.1% 3 + 12.3% +3.6%