Given the following probability distribution, what are the expected return and the standard

deviation of returns for Security J$?$

$5\mathrm{.}50\%$;$3\mathrm{.}30\%$

$6\mathrm{.}50\%$;$3\mathrm{.}60\%$

$7\mathrm{.}50\%$;$3\mathrm{.}90\%$

$6\mathrm{.}00\%$;$3\mathrm{.}00\%$

$7\mathrm{.}00\%$;$2\mathrm{.}70\%$