upper and lower limits, Operation Management

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The upper and lower limits for diving ring diameters made by John''s Swimming are 40 and 39 cm. John took 11 samples with the following average diameters (39, 39.1, 39.2, 38.9, 39.4, 39.5 39.6, 39.7, 39.8, 39.9, 40.1). Is the process in control?

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