You have observed the historical monthly returns of asset A:

Month Returns $\%$

$1$

$8$

$2$

$3$

$3$

$-1$

$4$

$0$

$5$

$0\mathrm{.}5$

$1.$ What is the arithmetic mean return of this stock?

$2.$ What is the standard deviation of returns of this stock $($in decimal form$)?$ Just type A$,$ B$...$ or E in your answer box.

A$.0\mathrm{.}01123$

B$.0\mathrm{.}02156$

C$.0\mathrm{.}03612$

D$.0\mathrm{.}06512$

E$.0\mathrm{.}07751$