Yam Growth data
The area for each value is 1/20 of the total histogram area. (Click on any rectangle to see the corresponding value.)
Select Narrower classes and Wider classes from the pop-up menu to change the class width of the yellow classes. Each value is still represented by the same area but the shape of its rectangle changes.
Mention that using 'frequency' as the vertical axis would give a misleading impression of the distribution.