A process sampled $20$ times with a sample of size $8$ resulted in $\frac{?}{\text{b}\text{a}\text{r}}(\stackrel{}{x})=28\mathrm{.}5$ and $\frac{?}{\text{b}\text{a}\text{r}}(R)=1\mathrm{.}8.$ Compute the upper and lower control limits for the $\stackrel{}{x}$ and $R$ charts for this process. Round your answers to two decimal places. Use Table $19\mathrm{.}3.$

$R$ Chart:

UCL

LCL

$\stackrel{}{x}$ Chart:

$\backslash$table$[[$UCL$,3$