The last four years of returns for a stock are as shown here: Year,$1,2,3,4$

Return $(\%),-3\mathrm{.}6,27\mathrm{.}5,12\mathrm{.}2,3\mathrm{.}9$

a$.$ What is the average annual return?

b$.$ What is the variance of the stock's returns? must be in $5$ decimal place format 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.