Please show how me the steps to solve:

$1)$ A stock has an average rate of return of $11\mathrm{.}5\%$ and a standard deviation of $12\mathrm{.}8\%.$ What is the probability that the stock will lose more than $26\mathrm{.}9\%$ in any one year?

A$)0\mathrm{.}50\%$

B$)1\mathrm{.}00\%$

C$)1\mathrm{.}25\%$

D$)2\mathrm{.}50\%$

E$)5\mathrm{.}00\%$

$2.)$Over the past five years, Redstone Enterprises produced returns of $31\%,38\%,-41\%,8\%,$ and $15\%.$ The mean of these returns is $\_\_\_\_\_\%$ and the standard deviation is $\_\_\_\_\_\%.$

A$)10\mathrm{.}2$; $27\mathrm{.}77$

B$)10\mathrm{.}2$; $31\mathrm{.}04$

C$)10\mathrm{.}2$; $35\mathrm{.}85$

D$)26\mathrm{.}6$; $27\mathrm{.}77$

E$)26\mathrm{.}6$; $31\mathrm{.}04$