IGCSE Maths / Probability

Conditional probability from a two way table revision notes

Edexcel International GCSE Maths (4MA1), chapter 20: Probability, specification point 6.3c. Part of the full course.

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A two-way table organises counts for two groups, so you can complete missing values and find probabilities. For a probability with a condition, use only the row or column named by the condition as the denominator.

More lessons in Probability

• The language of probability and the probability scale
• Listing outcomes systematically
• Theoretical probability and sample space
• Relative frequency and mutually exclusive events
• Expected frequency and relative frequency
• Multiplying independent probabilities
• At least one, and the complement
• Tree diagrams with replacement
• Tree diagrams without replacement
• Three stage tree diagrams
• Probability problem solving
• Conditional probability from a Venn diagram
• Conditional probability without replacement
• Forming an equation from a probability