Charts and averages
Lesson 10 of 10
The range
Objective. Find the range and say what it tells you.
The key idea
Range = largest − smallest. It measures spread, not typical size, so a small range means consistent values.
Worked example
Find the range of 6, 2, 9, 4.
- 1Largest: 9.
- 2Smallest: 2.
- 39 − 2 = 7.
Answer: 7
Practice
Each question comes with a picture and a listen button. Try it first, then reveal the answer.
Common mistake. Reporting the range as 'from 2 to 9' rather than a single number.
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