a$)$ For the given sample size, the control limits for $3-$sigma $\stackrel{}{x}$ chart are:

Upper Control Limit $(UC{L}_{\frac{?}{\text{b}\text{a}\text{r}}()})=$

Ib$.($round your response to three decimal places$).$

Lower Control Limit $(LC{L}_{\stackrel{}{x}})=$

lb$.($round your response to three decimal places$).$

b$)$ The control limits for the $3-$sigma R$-$chart are:

Upper Control Limit $(UC{L}_R)=$

lb$.($round your response to three decimal places$).$

Lower Control Limit $(LC{L}_R)=$

lb$.($round your response to three decimal places$).$