Box plots: GCSE Maths revision
A box plot shows minimum, Q1, median, Q3 and maximum. Use it to compare median (typical value) and IQR or range (spread).
Comparing two plots
Write two sentences: one about average (median) and one about spread (IQR), in context — “Class A typically scored higher”, not just “the median is bigger”.
Try these questions
Cover the answers and have a go first. Worked solutions are underneath.
Median 12, Q1 8, Q3 17. IQR?
What five values does a box plot display?
Common mistakes
- Comparing the longest whisker and calling that “better”.
Answers and working
Frequently asked questions
Where is the median on a box plot?
The line inside the box, not necessarily in the centre of the box if the data is skewed.
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