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ProbabilityExam Tips

Exam Tips

Part of Two-Way Tables — GCSE Mathematics

This exam tips covers Exam Tips within Two-Way Tables for GCSE Mathematics. Revise Two-Way Tables in Probability for GCSE Mathematics with 12 exam-style questions and 4 flashcards. This topic appears less often, but it can still be a useful differentiator on mixed-topic papers. It is section 4 of 4 in this topic. Treat this as a marking guide for what examiners are looking for, not just a fact list.

Topic position

Section 4 of 4

Practice

12 questions

Recall

4 flashcards

Exam Tips

  • Always check totals - row totals + column totals should equal grand total
  • Read carefully - distinguish between "and" (joint) vs "or" (marginal)
  • For conditional probability - use the relevant row or column as the denominator
  • Show your working - write probabilities as fractions first
  • Check your answer - probability should be between 0 and 1

Keep building this topic

Read this section alongside the surrounding pages in Two-Way Tables. That gives you the full topic sequence instead of a single isolated revision point.

Example: Student Subject PreferencesOrganizing Data in TablesKey Facts

Practice Questions for Two-Way Tables

A two-way table shows information about 80 students. It shows whether they study French or Spanish, and whether they are in Year 10 or Year 11. The total number of Year 10 students who study French is the value found by looking at which intersection?

  • A. The Year 10 row and the Total column
  • B. The French column and the Year 10 row
  • C. The Total row and the French column
  • D. The Total row and the Total column
1 markfoundation

Explain why the denominator changes when finding conditional probability from a two-way table.

2 markshigher

Quick Recall Flashcards

What is a joint frequency?
The number in each cell, representing the intersection of a row and column
What is a two-way table?
A table that shows frequencies for two categorical variables

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