$($Related to Checkpoint $7\mathrm{.}1)($Expected rate of return and risk$)$ B$.$ J$.$ Gautney Enterprises is evaluating a security. One$-$year Treasury bills are currently paying $5\mathrm{.}5$ percent. Calculate the investment's expected return and its standard deviation. Should Gautney invest in this security?

$\backslash$table$[[$Probability$,$Return$],[0\mathrm{.}10,-5\%$