A stock has an expected return of $8\mathrm{.}21$ percent and its reward$-$to$-$risk ratio is $6\mathrm{.}9$ percent. If the risk$-$free rate is $2\mathrm{.}2$ percent, what is the stock's beta?

Multiple Choice

$\mathrm{.}93$

$\mathrm{.}87$

$76$

$1\mathrm{.}02$

$1\mathrm{.}18$