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are you referring to a distribution curve?
I think so. He stated to me
The shape of the curve actually does tell us a great deal about that group and their performance. Bell curves can be symmetrical, flat, peaked, skewed, narrow, and so on. One of the quickest things that one can take away from a quick glance at the curve is how varied the scores were; that is, how similar or different those in the study were/are.