In order to calculate this value we must first understand what the lower quartile, median and upper quartile are: the lower quartile is the median of the lower half of the data. The \(\frac{(n+1)}{ ...

The interquartile range is the upper quartile – the lower quartile, so for this data the interquartile range is 47 - 38 =9. Back to top Drawing a box plot from a cumulative frequency Drawing a ...