The first decile (D1) is a number such that one tenth of the observations are smaller and nine tenths are larger.
The ninth decile (D9) is a number such that nine tenths of the observations are smaller and one tenth are larger.
The interdecile range is D9 - D1
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The range of a set of numbers is the largest minus the smallest. Whether it is an even set or odd is totally irrelevant.
it is the greatest number in a set minus the least number in the same set. the difference is the range.
The difference between the largest and smallest numbers in a data set is called the range.
Range is the span of your y values for each x
Within a given range, the set of rational numbers is greater. Without a given range, both sets are infinite and a comparison is not very helpful.