Use the previously calculated standard deviations for Dell, HP and the market to estimate Dell$$s and HP$$s betas

Year

Market

Dell

HP

$1$

$30\%$

$26\%$

$47\%$

$2$

$7$

$15$

$-54$

$3$

$18$

$-14$

$15$

$4$

$-22$

$-15$

$7$

$5$

$-14$

$2$

$-28$

$6$

$10$

$-18$

$40$

$7$

$26$

$42$

$17$

$8$

$-10$

$30$

$-23$

$9$

$-3$

$-32$

$-4$

$10$

$38$

$28$

$75$

A$.$ Beta$($Dell$)=0\mathrm{.}6$; Beta$($HP$)=1\mathrm{.}31$

B$.$ Beta$($Dell$)=0\mathrm{.}9$; Beta$($HP$)=0\mathrm{.}8$

C$.$ Beta$($Dell$)=1\mathrm{.}2$; Beta$($HP$)=-1\mathrm{.}31$

D$.$ Beta$($Dell$)=-0\mathrm{.}4$; Beta$($HP$)=0\mathrm{.}7$