The interquartile range (IQR) is a statistical measure of the middle values of a sample data set that is separated into four equal parts. This middle-value grouping can provide a median range ...

Discover what quartiles are in statistics, how to calculate them, and see examples to help you interpret data more ...

Finding the interquartile range A cumulative frequency diagram is also a good way to find the interquartile range, which is the difference between the upper quartile and lower quartile .

Learn about and revise how to find the mean, median and mode averages from data with this BBC Bitesize GCSE Maths Eduqas study guide.