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One hundred percent of the scores in a normal distribution fall within plus or minus two standard deviations of the mean.
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One hundred percent of the scores in a normal distribution fall within plus or minus two standard deviations of the mean.

User Lyzkov
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This is wrong:

68% fall within plus or minus ONE standard deviation

95% fall within plus or minus TWO standard deviation

99.7% fall within plus or minus THREE standard deviation
User BIU
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