Interquartile range - Wikipedia
https://en.wikipedia.org/wiki/Interquartile_range
WEBIn descriptive statistics, the interquartile range ( IQR) is a measure of statistical dispersion, which is the spread of the data. [1] . The IQR may also be called the midspread, middle 50%, fourth spread, or H‑spread. It is defined as the difference between the 75th and 25th percentiles of the data.
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