$2$pt$)$ By using the dataset, the sample means of weekly returns of three stocks are

$($rAAP L$,$rAM ZN $,$rN F LX $)=$

$($a$)(0\mathrm{.}29\%,0\mathrm{.}65\%,0\mathrm{.}14\%)$

$($b$)(0\mathrm{.}53\%,0\mathrm{.}65\%,0\mathrm{.}14\%)$

$($c$)(0\mathrm{.}44\%,0\mathrm{.}15\%,0\mathrm{.}66\%)$

$($d$)(0\mathrm{.}53\%,0\mathrm{.}65\%,0\mathrm{.}66\%)$