Approximately 68.3% of the values in a normal distribution will be within two standard deviations of the distribution mean.

Name: Approximately 68.3% of the values in a normal distribution will be within two standard deviations of the distribution mean.
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Quizplus · Accepted Answer

Approximately 68.3% of the values in a normal distribution are within one standard deviation of the mean, not two. Within two standard deviations, about 95.4% of the values are included.