Although you once earned a 100 on your physics exam,you have subsequently been unable to earn a perfect score again.Your experience may be understood in terms of

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Regression toward the average is the phenomenon where extreme scores on a measure tend to be followed by scores that are closer to the mean on subsequent measures. In this case, the initial perfect score on the physics exam was likely an outlier, and subsequent scores are regressing toward the average performance of the individual on physics exams.

Although You Once Earned a 100 on Your Physics Exam,you