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The Inter-quartile range is the range of the middle half of the data. It is the difference between the upper and lower quartile.

Example: 35,80,100 110,120,120,170,180.

The Inter-quartile range would be 145-90 or 55
To find the interquartile range, you:

1) Arrange the data in numerical order.

2) Then find the median of the data sets.

3) Find the median of the top half and bottom half. (of the set of numbers)

4) The groups you now have are "quartiles"

5) Find the interquartile range. (subtract the smaller range from the range)

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12y ago

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Q: How do you find the interquartile range of a data?
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