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Two-way tables organise data by two categories at once. This topic completes them, reads values and uses them to find totals and probabilities. It's a core topic in GCSE and iGCSE Maths with Edexcel and the other major boards. This free interactive course teaches the method with worked examples and gives instant-feedback practice questions to lock it in.
How you do it
Fill in the totals row and column first, then work back into the gaps by subtraction. Read the probability off by taking the right cell over the right total — the whole total for an ordinary probability, a row or column total for a conditional one.
Before you start
Before starting, revisit basic probability and reading tables. It underpins conditional probability.
What you learn
A two-way table sorts data by two things at once. A two-way table classifies data by two categories at once. Missing entries are found from the fact that each row and column adds to its total. Once the table is complete, P(event) = matching cell(s) ÷ grand total. The course works through reading a two-way table, completing a two-way table and probabilities from a two-way table. Every section has instant-feedback practice questions matched to Edexcel iGCSE 4MA1 and the other major GCSE boards, and the course finishes with full exam-style questions you mark yourself.
Related Topics
We teach Two-Way Tables as one of the Probability topics in our GCSE course library, at Foundation tier. You work through 3 concepts and 2 worked examples, testing yourself at 3 points. Related topics students usually take next include Venn Diagrams, Venn Diagrams & Set Notation, Without Replacement and And / OR rules. For unlimited practice, the Probability revision engine builds new questions on demand and records your accuracy.
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