Whole Grains LLC uses statistical process control to ensure that their health$-$conscious, low$-$fat, multi$-$grain sandwich loaves have the proper weight of $6$ oz$.$ Based on a previously stable and in$-$control process, the control limits of the and R charts are: UCL $=5\mathrm{.}70,$ LCL $=5\mathrm{.}34,$ UCLR$=1\mathrm{.}219,$ LCLR$=0.$ Over the past few days, they have taken five random samples of four loaves and have found the following.