Use: Stat > Quality Tools > Capability Sixpack > Normal
Since the data are organized by rows, use the option Subgroups across rows of: and introduce C2-C6. Remember that the specifications are 7.5 ± 0.1.
An evident conclusion obtained from the graph of the sample means (Xbar Chart) is that the process becomes decentred towards larger values. The reason for that should be studied; perhaps it is a badly calibrated machine, a wear and tear of the tools, etc. Concerning the range chart, there is nothing to object. The histogram is decentred with respect to the target value; the default values of the scale are changed to show this more clearly.
The required capability index Cp > 1.33 is met in this case (also Pp > 1.33), although it appears ...