Long description

The first chart plots sample mean in milligrams versus subgroup number with lower and upper control limits of 494.88 and 504.92, respectively, and central line x bar = 499.9. The graph falls below the lower limit in subgroup number 17.

The second chart plots sample range in milligrams versus subgroup number with lower and upper control limits of 0 and 18.40, respectively, and central line R bar = 8.7. The graph rises above the upper limit in subgroup 4.

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