Process time at a workstation is monitored using sample mean and range control charts. Six samples of n $=9$ observations have been obtained and the sample means and ranges computed as $0\mathrm{.}5($in minutes$).$

Determine the upper and lower limits for the range control charts.

Question $32$ options:

$4\mathrm{.}24,6\mathrm{.}96$

$0\mathrm{.}09,0\mathrm{.}91$

$1\mathrm{.}91,2\mathrm{.}96$

$3\mathrm{.}24,4\mathrm{.}24$