This exam tips covers Exam Tips within Conditional Probability for GCSE Mathematics. Revise Conditional Probability in Probability for GCSE Mathematics with 14 exam-style questions and 12 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 4 of 5 in this topic. Treat this as a marking guide for what examiners are looking for, not just a fact list.
Exam Tips
- Identify the condition - what's given (after the |)
- Reduce your focus - only consider outcomes where the condition is true
- Use tables and diagrams - they make conditional probability clearer
- Check your answer - conditional probabilities should still be between 0 and 1
- Practice with real contexts - medical tests, weather, games
Practice questions for Conditional Probability
What does the notation P(A|B) mean?
P(A) = 0.4, P(B) = 0.3 and P(A ∩ B) = 0.12. Using conditional probability, determine whether A and B are independent events. You must show all your working and give a reason for your conclusion.
Quick recall flashcards
What does the vertical bar | mean in P(A|B)?
It means 'given that'. P(A|B) is read as 'the probability of A given B'. The event after the bar is the condition — it is already known to have occurred.
What is conditional probability?
The probability of one event occurring given that another event has already occurred. It restricts the sample space to only the outcomes where the condition is met.