alleryStart learning →In a normal distribution, about what percent of values lie within one standard deviation of the mean?
AAbout 34 percent
BAbout 95 percent
CAbout 68 percent
DAbout 50 percent
Answer & Solution
Correct answer: C. About 68 percent
1. The empirical rule gives three quick figures for a normal curve.
2. Within one standard deviation of the mean sits about 68 percent of the values.
3. About 95 percent sits within two standard deviations, which is the trap on offer here.
4. The figure of 34 percent covers only one side of the mean, not both.
_Source: OpenStax High School Statistics (CC BY 4.0), section 6.1 The Standard Normal Distribution_
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