When you ask your teacher how the class did on the test, all you are told is that the results can be described by a bell-shaped curve, or normal distribution. From this, you should be able to deduce that most student scores

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A bell-shaped curve, or normal distribution, indicates that most values (in this case, student scores) are clustered around the mean, with fewer values at the extremes.  Galton was the first to suggest that most people fell in the mid-range of intelligence with a small percentage falling toward the extremes of giftedness or intellectual disability.

When You Ask Your Teacher How the Class Did on the Test