Question: A range control chart ( R - chart ) was developed with LCLR = 0 and UCLR = 2 . 9 0 . Similarly, an

A range control chart (R-chart) was developed with LCLR =0 and UCLR =2.90.
Similarly, an X-Bar chart was developed with LCLx-bar =15 and UCLx-bar =24.
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?

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