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Paper 2 & 3
Averages & Range
Foundation
Box plots highlight median and range.
Key Facts
- Range = highest - lowest.
- Median is robust to outliers.
Topics Covered
Mean, Median, Mode
What you need to know
- •Mean = total ÷ number of values.
- •Median is the middle value.
Exam Tips
- Order data before finding median.
Range & Comparison
What you need to know
- •Range = highest - lowest.
- •Median is less affected by outliers.
Exam Tips
- Mention outliers when comparing sets.
Key Terms
Outlier
A value far from the rest of the data.
Median
The middle value in an ordered list.
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Common Exam Questions
Find the median of 6, 2, 9, 1, 8.
1 markeasyPaper 3
Model Answer
6
What examiners want to see
- ✓Order the values first.
Find the range of 3, 8, 14, 20.
1 markeasyPaper 3
Model Answer
17
What examiners want to see
- ✓Highest minus lowest.
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