Question $4$: $(20$ points$)$

$4$a$.$ What are the process capability indices for this process to meet design specifications?

$4$b$.$ What do you recommend? $($Hint: Compute the standard deviation of these data and $17\mathrm{.}9,17\mathrm{.}10,17\mathrm{.}11,$ and $17\mathrm{.}12).$