Home › Praxis Core (Teaching) › Mathematics › The Normal Distribution › In a normal distribution, about what percent of …
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_
Related questions
Recognising the standard normal distribution matters because it can then be:The z-scores minus 2 and plus 2 correspond to which pair of original values in a distributIf about 68 percent of values lie within one standard deviation, the share lying outside tA z-score of zero corresponds to a value that is:Two normal curves with different standard deviations must still have equal:A normal distribution is often described by the shape of its curve as:The z-scores that bound the middle 99.7 percent of a normal distribution are:Between one standard deviation and two, the extra share of values captured is about: