This exam tips covers Exam Tips within Tree Diagrams for GCSE Mathematics. Revise Tree Diagrams in Probability for GCSE Mathematics with 15 exam-style questions and 20 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 5 of 7 in this topic. Treat this as a marking guide for what examiners are looking for, not just a fact list.
Exam Tips
- Check probabilities add to 1 at each branching point
- Label all branches clearly with both outcome and probability
- Use fractions when possible - they're often easier to multiply than decimals
- Identify the type - with or without replacement affects subsequent probabilities
- Multiply along paths - for specific sequences
- Add across paths - for combined events
- Double-check final probabilities - all outcomes should sum to 1
Practice questions for Tree Diagrams
A fair coin is flipped twice. In a tree diagram, what must the probabilities on the branches from the same point always add up to?
Explain the two key rules used when calculating probabilities from a tree diagram. Your answer should refer to both the multiplication rule and the addition rule.
Quick recall flashcards
What is a tree diagram?
A visual representation of all possible outcomes in multi-stage events
What does each branch in a tree diagram represent?
A possible outcome at that stage of the experiment