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Paper 2 & 3
Probability
Foundation
Count outcomes quickly to find probability.
Key Facts
- If P(A) = 0.3 then P(not A) = 0.7.
- Mutual exclusive outcomes add.
Topics Covered
Single Events
What you need to know
- •Probability = favourable/total.
- •Probabilities add to 1.
Exam Tips
- Check your fraction is between 0 and 1.
Two-Step Events
What you need to know
- •Multiply along branches.
- •Add across outcomes.
Exam Tips
- Label each branch clearly.
Key Terms
Sample space
List of all possible outcomes.
Mutually exclusive
Events that cannot happen together.
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Common Exam Questions
A spinner has 5 equal sections. What is P(blue) if 2 sections are blue?
1 markeasyPaper 3
Model Answer
2/5
What examiners want to see
- ✓Favourable over total.
Two coins are tossed. Find P(two heads).
2 marksmediumPaper 2
Model Answer
1/4
What examiners want to see
- ✓List outcomes or use tree diagram.
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