In a normal distribution, about 68% of values fall within 1 standard deviation of the mean, about 95% fall within 2 standard deviations of the mean, and about 99.7% fall within 3 standard deviations of the mean.
Added by Mary B.
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A normal distribution is a bell-shaped curve that represents a set of data that is symmetrically distributed around the mean. In a normal distribution, the mean, median, and mode are all equal, and the standard deviation measures the spread of the data. Show more…
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