Quality Analyst wants to construct a control chart for determining whether three machines, all producing the same product, are under control with regard to a particular quality variable. Accordingly, four units of output were sampled from each machine, with the following results:$10$poitsMachineMeasurements#$1171515171216251825132324232200$:$43$:$28$Using the factors for three sigma control limits$,$ what are the x$-$bar chart upper and lower control limits$?$