The range of a finite data set is the difference between its greatest and least values, found by subtracting the minimum from the maximum; repeated values do not change the range, and the result is expressed in the same units as the data. It describes the total span of the observations and provides a basic measure of variability, but does not include interquartile range, variance, or other more advanced measures of spread.
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The range tells how far apart the smallest and largest values are.
To find the range:
Example: The numbers of pages read by five students are:
The range is pages. The repeated value does not change the range.
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