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 7-26. Construct a chart for the moving range of two successive observations and a chart for individuals.

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TABLE 7-26 Octane Octane Octane Octane Sample Rating Sample Rating Sample Rating Sample Rating 1 89.2 6 87.5 11 85.4 16 90.3 2345 86.5 7 92.6 12 91.6 17 85.6 88.4 87.0 13 87.7 18 90.9 91.8 90.3 96 89.8 14 85.0 19 82.1 10 92.2 15 91.5 20 85.8