• How to read values from scatter graphs.
  • How to use scatter graphs to compare two different categories.
  • How to identify correlation on scatter graphs.
  • How to calculate averages from scatter graphs.



An English teacher produces a scatter graph to compare the percentage scores of a group of year 11 students in a mock exam against their percentage scores on a final exam.

What percentage of students got a higher score on the final exam than on the mock exam? Give your answer to two decimal places.

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The ‘Guide to the QTS Numeracy Skills Test’ book contains a full chapter on scatter graphs, including step-by-step explanations and demonstrations of all the skills that you need to know, and a practice exercise on the topic with 20 questions.

If you would like to be sent fully worked solutions to that exercise, just pop your details in the boxes and we will send them over to you.

If you are still struggling with this topic, we have created a selection of resources to provide all the help you need.


  • QTS Numeracy Revision Book – The Guide to the QTS Skills Tests book devotes a whole chapter to the topic of scatter graphs, with detailed methods, worked examples and plenty of practice questions for you to have a go at.
  • Practice QTS Numeracy Tests – Want to put your skills to the test and see how ready you are? Take a look at our selection of practice papers for the QTS numeracy test.
  • QTS Numeracy Revision Cheat Sheets – Our cheat sheets boil down everything you need to know to just the key points on the topic. They are a perfect resource for your last minute revision!
  • QTS Numeracy Coaching – Coaching is the ultimate in personalised support. Book your one-on-one Skype video calls where you can work through the issues that you struggle with at a pace that suits you.