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. Year $1-3\mathrm{.}8,$ Year $2+28\mathrm{.}1,$ Year $3+12\mathrm{.}1,$ Year $4+3\mathrm{.}9$