Introduction to Statistical Quality Control, $8$th Edition Douglas C$.$ Montgomery

$6\mathrm{.}13.$ A critical dimension of a machined part has specifications $100+-10.$ Control chart analysis indicates that the process is in control with $\stackrel{}{x}=104$ and $\frac{?}{\text{b}\text{a}\text{r}}(R)=9\mathrm{.}30.$ The control charts use samples of size $n=5.$ If we assume that the characteristic is normally distributed, can the mean be located $($by adjusting the tool position$)$ so that all output meets specifications? What is the present capability of the process?