The interquartile range is another measure of spread, except that it has the added advantage of not being affected by large outlying values. In order to calculate this value we must first understand ...

The table below shows the lengths (in cm) of 32 cucumbers. To calculate the cumulative frequencies, we simply add the frequencies in turn as we go down the values in the table.

Daniel Liberto is a journalist with over 10 years of experience working with publications such as the Financial Times, The Independent, and Investors Chronicle. Khadija Khartit is a strategy, ...