The last four years of retums 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?

Note: Notice that the average return and standard deviation must be entered in percentage format. The variance must be entered in decimal format.

a$.$ What is the average annual return?

The average return is

$\%.($Round to two decimal places$)$

Data table

$($Click on the following icon $$ in order to copy its contents into a spreadsheet.$)$

$\backslash$table$[[$Return$,\frac{1}{400},2,3,4],[$Return$,-4\mathrm{.}3\%,+28\mathrm{.}5\%,+12\mathrm{.}4\%,+3\mathrm{.}7\%$

This question has a$,$ b$,$ and c please answer all three. Thank you!