At Isogen Pharmaceuticals, the filling process for its asthma inhaler is set to dispense 150 millimeters (ml) of steroid solution per container. The average range for a sample of 4 containers is 3 ml. use table to establish control limits for sample means and range for the filling process.
Factors for calculating three sigma limits for the x-chart and R-chart

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Size ofFactor for UCL and LCL for Sample (n) Factor for LCL for R-Chart (Da Factor for UCL for R-Chart (D 3 267 2.575 2 282 2.115 2004 1.924 1.864 x-Chart (Aa) 1.880 1.023 0.729 0.577 0.483 0.419 0.373 0.337 0.308 0076 0.136 0.184 0.223 10