H2 Maths Probability Notes | Conditional & Independence
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H2 Maths probability notes: key formulas and worked examples for conditional probability, independence, Venn diagrams, and A-Level exam techniques.
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- Quick probability map
- Core Definitions
- Diagram Workflows
- Common Question Types
Q: What does H2 Maths Notes (JC 1-2): 6.1) Probability cover?
A: Conditional probability, independence tests, event diagrams, and common JC exam traps for the 2026 H2 syllabus.
Study cadence
Tighten your language: every time you quote a probability, state the event clearly first. Keep a running list of assumptions (mutually exclusive, independent, equally likely) before applying shortcuts.
Quick probability map
| If you have... | Walk away with this | First action |
| 1 second | Probability is about clearly named events. | Define A and B before using formulas. |
| 10 seconds | Conditional probability changes the sample space. | Read "given" as "restrict attention to". |
| 100 seconds | Independence is a test, not a feeling. | Compare the joint probability with the product of the separate probabilities. |
Concrete example: If 60 students take Physics, 45 take Maths, and 35 take both, the "Physics given Maths" denominator is 45, not the whole cohort.
Status: SEAB's current H2 Mathematics (9758) syllabus PDF is labelled for 2026. Topic 6.1 is assessed in Paper 2 Section B (Probability and Statistics, 60 marks) and covers counting and conditional probability workflows.
Core Definitions
- Sample space
