using $3-$sigma?

Upper Control Limit $(($:$UC{L}_R\}($round your response to two decimal places$).$

Lower Control Limit $(($:$LC{L}_R\}($round your response to two decimal places$).$

e$)$ If the true diameter mean should be $155mm$ and you want this as your center $($nominal$)$ line, what are the new $UC{L}_{\frac{?}{\text{b}\text{a}\text{r}}()}$ and $LC{L}_{\frac{?}{\text{b}\text{a}\text{r}}()}?$

Upper Control Limit $($UCL$-($:$U_{\frac{?}{\text{b}\text{a}\text{r}}()}\}($round your response to two decimal places$).$