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 ...

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 ...

For National 5 Lifeskills Maths, revise how data sets can be compared using averages and measures of spread. BBC Homepage. Skip to content; ... Comparing data sets Semi-interquartile range.