Interquartile range
I can calculate the IQR and interpret what this means.
Interquartile range
I can calculate the IQR and interpret what this means.
These resources will be removed by end of Summer Term 2025.
Lesson details
Key learning points
- The interquartile range tells us how spread out the middle 50% of the data is
- This can be seen visually with a box plot
- Box plots and cumulative frequency graphs can be compared
- This comparison involves the median and interquartile range
Keywords
Interquartile range - Interquartile range is calculated by finding Q3 − Q1. This is because it is the range from the first to the third quartile.
Common misconception
Not referring to the context of the question when comparing the data.
Highlight that just saying the median or the interquartile is bigger is of little use unless you know what the data was about.
To help you plan your year 11 maths lesson on: Interquartile range, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your year 11 maths lesson on: Interquartile range, download all teaching resources for free and adapt to suit your pupils' needs.
The starter quiz will activate and check your pupils' prior knowledge, with versions available both with and without answers in PDF format.
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The assessment exit quiz will test your pupils' understanding of the key learning points.
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Explore more key stage 4 maths lessons from the Graphical representations of data: cumulative frequency and histograms unit, dive into the full secondary maths curriculum, or learn more about lesson planning.
Licence
Starter quiz
6 Questions



Exit quiz
6 Questions



