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What conditional probability means

What conditional probability means

Conditional probability asks for the chance of event BBB given that event AAA has already happened. It is written P(B∣A)P(B|A)P(B∣A). The words "given that" tell you that the sample space has been restricted to outcomes where AAA occurs.

Conditional Probability Lesson

  1. IGCSE
  2. /Maths
  3. /Conditional Probability

Step-by-step lessons covering Edexcel IGCSE Maths Conditional Probability for IGCSE Maths. Each lesson works through exam-style questions in Paper 1 and Paper 2 format. Build confidence with the shared Foundation-tier content first, since roughly 40% of Higher-tier marks are targeted at the grades 4–5 boundary that both tiers have in common.

Lessons

SurdsBoundsDirect and Inverse ProportionQuadratic FormulaFactorising Harder QuadraticsAlgebraic FractionsRearranging Harder FormulaeFinding the Area of Any TriangleThe Sine RuleThe Cosine Rule3d Pythagoras and TrigonometryThe Magnitude of a VectorHistogramsConditional Probability