In a box plot, it is easy to see the range of where 50% of your data lies. Let’s examine this a little further by describing the interquartile range. Quartiles can be defined as dividing your ...

Reading from the graph, the upper quartile is 47. The interquartile range is the upper quartile – the lower quartile, so for this data the interquartile range is 47 – 38 = 9.

A cumulative frequency diagram reproduces this table as a graph. The table below shows ... The upper quartile is about 47 cm. The interquartile range is the upper quartile – the lower quartile ...