Learn how to calculate the interquartile range from a variety of different data types and draw and interpret box-and-whisker diagrams.

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 ...

Whiskers extend from the quartiles to the farthest observation not farther than 1.5 times the distance between the quartiles (the interquartile range). Beyond the whiskers, extreme observations are ...

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 ...