A. Most of the ideas are concentrated near the center line.<br> B. A few ideas fall near the regulatory limits.<br> C. The distribution of ideas is random and there are no rules to follow.<br> D. No ideas go beyond the limits of regulation (i.e. there are very few).<br> E. In accordance with these principles, we can find abnormal ideas, and the following diagram is one of the normal control diagrams:
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