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This lesson focuses on reading and completing two-way tables, using them to find probabilities, and working with probability distribution tables. Two-way table questions are a staple of the Edexcel GCSE Mathematics (1MA1) exam and appear on both Foundation and Higher papers.
A two-way table displays data that has been classified by two different categories. The rows represent one category and the columns represent another. The table includes row totals, column totals and a grand total.
| Category A | Category B | Total | |
|---|---|---|---|
| Group 1 | a | b | a + b |
| Group 2 | c | d | c + d |
| Total | a + c | b + d | a + b + c + d |
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