What you'll learn
Handling data and calculating chance.
Key skills
- Mean, median, mode, range; averages from tables; scatter graphs.
- Probability; mutually exclusive (add) and independent (multiply) events; tree diagrams.
Exam tips
- Grouped-data mean: Σ(fx) ÷ Σf.
- Multiply along tree branches.
Common mistakes
- Correlation ≠ causation.
- Adding when you should multiply.