AC9M9P01 • Test
Compound probability and tree diagrams
Use the Skillr scratchpad or a notebook to list outcomes, draw tables or tree diagrams, and decide whether each selection is with or without replacement.
SkillrHub quiz practice is built for curriculum-aligned revision with answer feedback and a clear review path.
60-second Quick Read
- For compound events, multiply the number of choices at each stage to count ordered outcomes.
- With replacement keeps probabilities the same; without replacement changes the second and later stages.
- Common trap: “A then B” is ordered, but “A and B in any order” usually needs both AB and BA.
SkillrHub Test guide
Use this short shuffled test set to check the skill, read feedback and review missed items. Repeat quiz practice to access more of the full question bank over time.
- Worked example: Before answering, classify what the question gives, what it asks for, and which curriculum idea links them. For Compound probability and tree diagrams, explain the evidence or method in one complete sentence before selecting the final answer.
- Common mistake: Do not match answers by familiar wording only. Check the full AC9M9P01 idea, the units or evidence, and any exception in the stem.
- Assessment guidance: Use this short shuffled set for one attempt. Repeat quiz practice to get access to more of the full question bank over time.
- SkillrHub review path: Use feedback to name the misconception, practise a corrected example, and retest only after you can justify the answer aloud.
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