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 data ...

The interquartile range (IQR) is therefore 18 - 4 = 14. You will notice that the fact there ... so the UQ is the 30th number. To find these from the graph we draw two lines across from the ...