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KS3Revision SheetProbability
Probability Quick Revision Sheet
A compact Probability summary with key facts, methods, reminders and common mistakes.
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Work through the content for this resource.
Revision Sheet
Probability: Revision Sheet
Remind me what I need to know.
A compact summary for quick review before practice, homework, mocks or exams.
Key facts and formulasImportant vocabularyMini examplesCommon mistakesQuick memory checks
Define the sample space clearly, then compare favourable outcomes with the total or restricted outcomes.
Key strands
- probability scale
- sample spaces
- Venn diagrams
- tree diagrams
- conditional probability
Revision checklist
- Can I identify the sample space?
- Can I use complements and intersections?
- Can I decide whether events are independent or dependent?
Common mistakes
- Adding when branches should be multiplied
- Using the original total after a condition has restricted the sample space
- Confusing union and intersection