Problem 28 Question Help An automatic lathe produces rollers for roller bearings, and the process is monitored by Statistical process control charts. The central line of the chart for the sample means is set at 8.40 and for the mean range at 0,4 mm. The process is in control, as established by samples of sizo 4 The upper and lower specifications for the diameter of the rollers ate (8.40 -0.35) and (840-035) mm, lively Click the icon to view the table of factors for calculating three sama limits for the x chart and R. chart a. Calculate the control limits for the mean and range charts The ucl.a equins 091 mm and the LCLR equals 0 mm (Enter your responses rounded to two decimal proces) The UC; quals (mm and the LCty quals mm (Enter your responses rounded to two decimat places.) Incorre Enter your answer in the edit fields and then click Check Answer 2 remaining parts Clear All CRAW