Key Facts About Measures of Spread
Part of Range & IQR · GCSE GCSE Mathematics revision
This key facts covers Key Facts About Measures of Spread within Range & IQR for GCSE Mathematics. Revise Range & IQR in Statistics for GCSE Mathematics with 12 exam-style questions and 20 flashcards. This topic appears less often, but it can still be a useful differentiator on mixed-topic papers. It is section 2 of 8 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 2 of 8
Practice
12 questions
Recall
20 flashcards
Key Facts About Measures of Spread
- Range: Highest value - Lowest value
- Quartiles: Values that divide ordered data into four equal parts
- Q1 (Lower Quartile): 25% of data is below this value
- Q2 (Median): 50% of data is below this value
- Q3 (Upper Quartile): 75% of data is below this value
- IQR (Interquartile Range): Q3 - Q1 (middle 50% spread)
Keep building this topic
Read this section alongside the surrounding pages in Range & IQR. That gives you the full topic sequence instead of a single isolated revision point.
Practice Questions for Range & IQR
The range of a set of data is calculated by:
Explain why the interquartile range (IQR) is sometimes preferred over the range as a measure of spread.
Quick Recall Flashcards
12 questions on Range & IQR — practise free
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