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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Quizplus · Accepted Answer

Regression toward the average is the tendency for extreme or unusual scores or events to return toward the average. In this case, the 100 on the physics exam was an unusual event, and the subsequent inability to earn a perfect score again is due to the fact that it is more likely to receive scores that are closer to the average performance.

Although You Once Earned a 100 on Your Physics Exam