The interquartile range is the difference between the lower quartile and the upper quartile. Consider the following data: 1, 3, 4, 6, 9, 14, 15, 17, 18, 22, 60 Firstly there are 11 numbers present.

National 5 Comparing data sets Median and quartiles Data sets can be compared using averages and measures of spread. A box plot displays information about the range, the median and the quartiles ...