b$.$ Determine $\frac{?}{\text{b}\text{a}\text{r}}(\stackrel{}{x})$ and $\frac{?}{\text{b}\text{a}\text{r}}(R).($Round your answers to $3$ decimal places.$)$

c$.$ Determine the UCL and $LCL$ for a $\stackrel{}{x}$ chart. $($Round your answers to $3$ decimal places.$)$

d$.$ Determine the UCL and LCL for $R-$chart. $($Leave no cells blank $-$ be certain to enter $"0"$ wherever required.

Round your answers to $3$ decimal places.$)$