The probability that a student will score between plus or minus one standard deviation from the mean on an exam, assuming the scores are normally distributed, is approximately 68%.

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This statement is true according to the empirical rule (also known as the 68-95-99.7 rule) for normal distributions. The rule states that approximately 68% of the data falls within one standard deviation of the mean.

The Probability That a Student Will Score Between Plus or Minus