Suppose you have collected four samples, where each sample has six observations. The sample means and ranges

have been calculated for each sample, which are provided below.

Sample Size is $6,A2=\mathrm{.}483,D3=0,D4=2\mathrm{.}004$

What is the upper control limit for the R$-$chart? $($Answer with three decimal places.$)$

Average of Sample Range $=3$

$CL=3$

What is the lower control limit for the xx $-$bar$)-$chart? $($Answer with three decimal places.$)$

Average of Sample Mean $=9$

$CL=9$