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Key Stage 3 Statistics
Averages and Spread
Use mean, median, mode and range to describe and compare data sets.
Key idea
Look at the data type, choose an appropriate summary or diagram, then interpret the result in context.
What you will learn
Use mean confidently.
Use median confidently.
Use mode confidently.
Use range confidently.
Success checklist
✓I can explain what averages and spread means.
✓I can choose a suitable method without being told.
✓I can show clear working and check my answer.
Worked example
Find the mean of 4, 7, 9 and 10.
Step 1
Add the values: 4 + 7 + 9 + 10 = 30.
Step 2
There are 4 values.
Step 3
30 ÷ 4 = 7.5.
Answer
7.5
Quick practice
Question 1
Find the median of 3, 8, 4, 10, 5.
Question 2
Find the range of 11, 18, 23, 24.
Question 3
Describe positive correlation in a scatter graph.
Related resources
These are linked to the wider Statistics topic for now.