Question: A range control chart (R-chart) was developed with LCLR = 0 and UCLR = 2.90. Similarly, a mean controlchart(x-bar chart) was developed with LCLX =

A range control chart (R-chart) was developed with LCLR = 0 and UCLR = 2.90. Similarly, a mean controlchart(x-bar chart) was developed with LCLX = 150 and UCLX = 240.00. Five (5) additional samples of size 4 were taken from a process. The means and ranges of the five samples are given in the table below. Is the process in control? Range of each sample Mean of each sample 1.75 29.5 2.42 22.3 2.75 17.4 2.04 20.1 2.80 18.9

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