A process is in statistical control with $\frac{?}{\text{b}\text{a}\text{r}}(\stackrel{}{x})=199$ and $\frac{?}{\text{b}\text{a}\text{r}}(R)=3\mathrm{.}5.$ The control chart uses a sample size of $n=4.$ Specifications are at $200+-8.$ The quality characteristic is normally distributed.

a$.$ Estimate the potential capability of the process.

b$.$ Estimate the actual process capability.