Data & Averages
Averages describe the middle; the range describes the spread.
Averages & rangeMean from a frequency tableScatter graphs & correlationComparing distributions
📖 Learn
Frequency tables
Mean = Σ(value × frequency) ÷ total frequency.
Correlation
Positive: both go up. Negative: one up, one down. None: no pattern.
Compare
Always compare an average AND the spread (range).
Worked example
Median of 3, 9, 4, 7, 12
- 1Order: 3, 4, 7, 9, 12
- 2Middle value
- 37 ✅
⭐ Practise
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