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Between one standard deviation and two, the extra share of values captured is about:
A27 percent
B5 percent
C68 percent
D95 percent
Answer & Solution
Correct answer: A. 27 percent
1. The empirical rule gives cumulative percentages, not shares of each band.
2. About 95 percent of the x values lie within two standard deviations of the mean.
3. About 68 percent lie within one standard deviation.
4. Subtracting gives roughly 27 percent for the band between one and two deviations.
_Source: OpenStax Introductory Statistics 2e (CC BY 4.0), Ch 6 'The Normal Distribution', sections 6.1-6.3_
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