Find the standard deviation for a security that has three one$-$year returns of $-9\%,11\%,$ and $17\%$ respectively.

$7\mathrm{.}72\%$

$6\mathrm{.}43\%$

$5\mathrm{.}36\%$

$11\mathrm{.}12\%$

$9\mathrm{.}26\%$