After finding the values of the mean and range for each year, find the values of x̿ and R̅. Then find the values of LCL and UCL for an R chart and find the values of LCL and UCL for an x chart.
Refer to the amounts of energy consumed in the author's home. (Most of the data are real, but some are fabricated.) Each value represents energy consumed (kWh) in a two-month period. Let each subgroup consist of the six amounts within the same year.

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3-3-3 9-0 34 24 4 8-9-1 ly-72- 2-3-3-4 2 24-26 24 54 27-61 1 234 5-678