The way that I do that, is to create a new column in the data table, and call it "Count", setting each rows value to 1. I then go to Graph Builder and select my x axis and then set my y axis to the count column, and it's statistic to sum.
![histo.PNG histo.PNG](https://community.jmp.com/t5/image/serverpage/image-id/18989i4ADD0D0097DFD456/image-size/large?v=v2&px=999)
There are soooooo many things you can do with Graph Builder, that there may be a Community member that can show a better way to solve your problem
Jim