Question $4$

$5$ pts

The upper and lower limits for the X$-$bar $($Average$)$ chart are $16\mathrm{.}15$ and $15\mathrm{.}90.$

The upper and lower limits for the R $($Range$)$ chart are $0\mathrm{.}40$ and $0\mathrm{.}15.$

Is the process under control? Why do you say that?