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Quartiles and five-number summary
Split an ordered data set into quarters to find the median, quartiles and interquartile range, and summarise it with five key numbers.
⏱ 18 min❓ 10 questions
What you'll be able to do
- ✔I can find the median and the lower and upper quartiles of a data set with an odd or even number of values
- ✔I can calculate the interquartile range and explain why it resists the effect of extreme values
- ✔I can write the five-number summary of a data set, including one given in a frequency table
How this works
- 1Read the short explanations first — they teach you what you need before each question.
- 2Answer each question, then tap Check. A right answer moves you on automatically; if it's wrong, you'll see a friendly explanation of why.
- 3Finish all 3 steps to see your score — sign in and subscribe to unlock the full lesson and save it.
What's inside
10 questions and 1 quick teaching card, including:
- 🔢Number answer — Work out the answer and type the number.
👪Grown-up tip: sit alongside younger learners for the first few lessons. Read the questions together and chat about the explanations — that's where the real learning sticks.
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Curriculum: AC9M10ST02