In a normal distribution, approximately what percent of subjects lie within two standard deviations of the mean?

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Multiple Choice

In a normal distribution, approximately what percent of subjects lie within two standard deviations of the mean?

Explanation:
This question banks on the empirical rule for a normal distribution. About 95% of observations lie within two standard deviations of the mean, with roughly 2.5% in each tail outside that range. That’s why two standard deviations captures most of the data around the mean. The 68% figure comes from within one standard deviation, and the 99.7% figure from within three standard deviations. The option representing 50% isn’t tied to this two-standard-deviation window.

This question banks on the empirical rule for a normal distribution. About 95% of observations lie within two standard deviations of the mean, with roughly 2.5% in each tail outside that range. That’s why two standard deviations captures most of the data around the mean. The 68% figure comes from within one standard deviation, and the 99.7% figure from within three standard deviations. The option representing 50% isn’t tied to this two-standard-deviation window.

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