In the normal distribution, over 99 percent of scores fall within how many standard deviations of the mean?

Question

Quizplus · Accepted Answer

According to the empirical rule, approximately 68% of scores fall within 1 standard deviation of the mean, approximately 95% of scores fall within 2 standard deviations of the mean, and approximately 99.7% of scores fall within 3 standard deviations of the mean in a normal distribution. Therefore, over 99 percent of scores fall within 3 standard deviations of the mean, making choice C the best answer.

In the Normal Distribution, Over 99 Percent of Scores Fall