The market portfolio has an expected return of $12\mathrm{.}4$ percent and a standard deviation of

$22\mathrm{.}4$ percent. The risk$-$free rate is $5\mathrm{.}4$ percent.

a$.$ What is the expected return on a well$-$diversified portfolio with a standard deviation of

$9\mathrm{.}4$ percent? $($Do not round intermediate calculations and enter your answer as a

percent rounded to $2$ decimal places, e$.$g$.,32\mathrm{.}16.)$

b$.$ What is the standard deviation of a well$-$diversified portfolio with an expected return

of $20\mathrm{.}4$ percent? $($Do not round intermediate calculations and enter your answer as

a percent rounded to $2$ decimal places, e$.$g$.,32\mathrm{.}16)$