The interquartile range is a measure of dispersion. The interquartile range (IQR) is the range of values covered by the middle 50% of a set of data. To find the interquartile range:
- find the median of the values to the left of the median (the lower quartile).
- Find the median of the values to the right of the median (the upper quartile).
- Subtract the median of the lower quartile from that of the upper quartile to get the interquartile range.
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