Box-and-whisker graphs require breaking a set into four equal parts. The middle value is the median. The middle of the bottom half is the lower quartile and the middle of the upper half is the upper quartile. Explanation is available at Box-and-Whiskers Info. Practice at Box-and-Whisker Practice
Interpret these graphs.
Make Your Own Box-and-Whiskers
Make your own graphs and interpet them using Bar Graph Maker