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It has no meaning.

In statistics, if you have a set of observations, the lower quartile (Q1) is the value such that a quarter of the [number of] observations are smaller and three quarters are larger. The upper quartile, Q3, is defined similarly as the value such that a quarter of the observations are larger.

The interquartile range, is the distance between these two:

IQR = Q3 - Q1.

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Q: What does inquartile range mean in math?
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