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 ...

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

The range is 35 1 = 34 The semi-interquartile range is 1 2 × (17 7) = 5. In cases like these it's often preferable to use the semi-interquartile range when you're comparing data.