Question $3$

$4pts$

Annual returns of Stock in the past $5$ years are presented in the following table:

$\backslash$table$[[,$Year $1,$Year $2,$Year $3,$Year $4,$Year $5],[$Stock B$,-0\mathrm{.}02,0\mathrm{.}08,0\mathrm{.}04,0\mathrm{.}06,-0\mathrm{.}04]]$

smpute the standard deviation of the annual return of Stock B$.$

$5\mathrm{.}18\%$

$8\mathrm{.}56\%$

$2\mathrm{.}4\%$

$4\mathrm{.}24\%$