In a gasoline-blending plant, the quality of the output as indicated by its octane rating is measured for a sample taken from each batch. The observations from 20 such samples are shown in Table 7-21. Construct a chart for the moving range of two successive observations and a chart for individuals.
TABLE 7-21

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Octane Octane Octane SampleangSapl g Sample Rating Saple Rating 89.2 86.5 88.4 91.8 90.3 87.5 92.6 87.0 89.8 92.2 85.4 91.6 87.7 85.0 91.5 16 17 18 19 20 90.3 85.6 90.9 82.1 85.8 4 14 10