A stock had the following annual returns: $10\mathrm{.}03\%,4\mathrm{.}40\%,-28\mathrm{.}49\%,$ and $15\mathrm{.}68\%.$ Compute the following for the stock:

A$.$ Expected Return $($Please write your answer as a percentage $($e$.$g$.\mathrm{.}1234$ should be written as $12\mathrm{.}34))$: $\%$

B$.$ Variance $($Please write your answer with $4$ decimal places$)$:

C$.$ Standard Deviation $($Please write your answers as a percentage $($e$.$g$.\mathrm{.}1234$ should be written as $12\mathrm{.}34))$: $\%$