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Cumulative frequency diagrams – GCSE mathematics mid-level

May 13, 2016 by Simon

cumulative frequency

Cumulative frequency diagrams are quite popular on GCSE mathematics papers. They can be fairly straightforward, although it’ll be useful to also practice box plots. The information is fairly similar … you can find the median, quartiles and ranges in both, with a typical question comparing information from both sources.

Q4 on these past paper questions might be useful to try. There isn’t a video, as it could be a little difficult to follow, although I hope the videos below will give you a head start  – please make contact if you need any help 🙂

Top Tips!

● Make sure, when you add all the frequencies, the total is the same as the information given in the question
● You plot the highest value of each class width against the cumulative frequency value (examples on the videos)
● The cf axis is always the vertical (y axis)
● On the cf axis, 50% = the median, 25% = lower quartile, 75% = upper quartile

If you’d like to ask for any more detail, or you’re not sure about anything, please do ask a question in the comments section.

All best with your studies

 

Watch on YouTube

How to draw a cumulative frequency diagram – lorries GCSE question 

How to draw a cumulative frequency diagram – teacher ages GCSE  

 

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