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 ...

Box plots characterize a sample using the 25th, 50th and 75th percentiles—also known as the lower quartile (Q1), median (m or Q2) and upper quartile (Q3)—and the interquartile range (IQR = Q3 ...

Box plots, also called box and whisker plots, are more useful than histograms for comparing distributions. ... from the 75 th percentile or 1.5 times the interquartile range ...