math
posted by Jelani .
I understand how to make a histogram but I have to make a cumulative frequency histogram. I'm not sure about how to change my current intervals. My current iuntervals are 02, 35, 68, 911 and 1214.

The number of whatever you are counting in each iterval would be the height of the bar in the chart that forms the histogram. There will be 5 bars, one for each interval.
You should not change your intervals if your data only has counts in those intervals you mentioned.