The interquartile mean is a measure of central tendency. While all values in a data set are used to calculate the mean, only the interquartile range -- the central portion of a data set -- is used ...

Learn how to calculate the interquartile range from a variety of different data types and draw and interpret box-and-whisker diagrams.

GCSE; Edexcel; Analysing data - Edexcel Range. In statistics there are three types of average: the mean, the median and the mode. Measures of spread such as the range and the interquartile range ...