Process time at a workstation is monitored using sample mean and range control charts. Six samples of n $=10$ observations have been obtained and the sample means and ranges computed $($in minutes$)$: LO$2$ Sample Mean Range $1.........3\mathrm{.}060\mathrm{.}422.........3\mathrm{.}150\mathrm{.}503.........3\mathrm{.}110\mathrm{.}414.........3\mathrm{.}130\mathrm{.}465.........3\mathrm{.}060\mathrm{.}466.........3\mathrm{.}090\mathrm{.}45$ Using the factors in Table $10-3,$ determine the upper and lower limits for sample mean and range control charts. Is the process in control?