The statistical concept of cumulative frequency is a simple one - it is
just a running total of frequencies. But it is also a very useful tool
to understand a set of data. A cumulative frequency curve lets you
easily read off estimates for the median and quartiles even when faced
with a large amount of data!
Learn all about cumulative frequency, the median and the interquartile range
with this colourful interactive tool!
Enter raw data, complete a frequency table or and complete the
cumulative frequency table, and then plot the curve(s).
A set of introductory videos is provided to help you understand how to create
and interpret cumulative frequency curves, and you can load the sample data
to help you save time!
Finally, have a go at the worksheets to check that you really
understand!