A stock has an average return of $10\mathrm{.}5$ percent and a standard deviation of $2\mathrm{.}3$ percent. What range of returns would you expect to see $68$ percent of the time on this security?

$3\mathrm{.}6$ percent to $17\mathrm{.}4$ percent

$1\mathrm{.}3$ percent to $19\mathrm{.}7$ percent

$5\mathrm{.}9$ percent to $15\mathrm{.}1$ percent

$8\mathrm{.}2$ percent to $12\mathrm{.}8$ percent