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

Part $7$

Upper Control Limit $($UCL Subscript Upper R$)$equals

$$

$0\mathrm{.}0780$ cm$.($Enter your response rounded to four decimal$$ places.$)$

Part $8$

Lower Control Limit $($LCL Subscript Upper R$)$equals

$$

$0\mathrm{.}0000$ cm$.($Enter your response rounded to four decimal$$ places.$)$

Part $9$

$$b$)$ Draw the charts and plot the values of the sample means and ranges.

Plot the values of the sample$$ means, centre line and control limits on the process control x overbar$-$chart. Choose the correct control chart below.