Stock Y has a beta of $1\mathrm{.}2$ and an expected return of $11\mathrm{.}5\%.$ Stock Z has a beta of $\mathrm{.}80$ and an expected return of $8\mathrm{.}5\%.$ The risk$-$free rate is $3\mathrm{.}2\%,$ and the market risk premium is $6\mathrm{.}8\%.$

a$.$ What is the reward$-$to$-$risk ratio of stock Y$?$

b$.$ What is the reward$-$to$-$risk ratio of stock Z$?$

c$.$ What is the SML reward$-$to$-$risk ratio?

d$.$ According to the CAPM, stock Y is overvalued or undervalued?

e$.$ According to the CAPM, stock Z is overvalued or undervalued?