Refer to Table S$6\mathrm{.}1-$ Factors for Computing$\_$Control Chart Limits $(3$ sigma$)$ for this problem.

Auto pistons at Wenming Chung's plant in Shanghai are produced in a forging process, and the diameter is a critical factor that must be controlled. From sample sizes of $10$ pistons produced

each day, the mean and the range of this diameter have been as follows:

a$)$ What is the value of $\frac{?}{\text{b}\text{a}\text{r}}(\stackrel{}{x})?$

$\frac{?}{\text{b}\text{a}\text{r}}(\stackrel{}{x})=,mm(round$ your response $to$ two decimal places$).$

b$)$ What is the value of $\frac{?}{\text{b}\text{a}\text{r}}(R)?$

$\frac{?}{\text{b}\text{a}\text{r}}(R)=4\mathrm{.}36mm(round$ your response $to$ two decimal places$).$

c$)$ What are the $UC{L}_{\frac{?}{\text{b}\text{a}\text{r}}()}$ and $LC{L}_{\frac{?}{\text{b}\text{a}\text{r}}()}$ using $3-$sigma?

Upper Control Limit $(UC{L}_{\stackrel{}{x}})=,mm($round your response to two decimal places$).$