Area histograms: choose your zones
A set of data is shown with the blue dots.
The pink dots divide the axis into zones and the AREA of the bars above each zone represent the amount of dots in each zone.
Move the pink dots to change the zones and see what happens to the bars. You can turn on and off the divisions within each bar using the checkbox.
If you want fewer zones, just put the pink dots to the left of the grid.
To see this same concept explored with playdough, check out https://youtu.be/4AWQlN4UaNc