A-Level Maths OCR B (MEI) (H640)

Be able to calculate conditional probabilities by formula, from tree diagrams, two-way tables, Venn diagrams or sample space diagrams.

$P(A|B) = \dfrac{P(A∩B)}{P(B)}$

Excludes: Finding reverse conditional probability i.e. calculating $P(B|A)$ given $P(A|B)$ and additional information.