Year 9 - Maths
Using two-way tables to display outcomes for two events
Probability: possible outcomes
Study Hub
Study Guides
This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
This unit introduces and explores the concept of liklihood as a relative measure, and demonstrates multiple ways to represent likelihood such as Venn diagrams, tree diagrams and two-way tables.
Lesson Summary
You will learn to systematically find all the possible outcomes for two events by using a two-way table.
Key Notes
- Possible outcomes for two events can be listed in a table.
- The outcome table can be used to generate a list of outcomes.
- A list of outcomes can be used to generate an outcome table.
Vocabulary To Learn
- Outcome table: An outcome table is a table that shows all the possible outcomes.
Common Mistakes To Avoid
- Pupils may worry about which event/stage of the trial should be the rows and which should be the columns in an outcome table.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
Possible outcomes for two events can be listed in a table. The outcome table can be used to generate a list of outcomes.
2. Use this key word in a maths sentence and explain it clearly. 'Outcome table'
An outcome table is a table that shows all the possible outcomes. Use this word when showing your method, then check your final answer is reasonable.
3. Spot and fix this common maths mistake.
Mistake: Pupils may worry about which event/stage of the trial should be the rows and which should be the columns in an outcome table. Correction: Explain that the rows and columns can be transposed. Depending on the context AB and BA may be the same outcome, whereas in other contexts they may be two different outcomes, so a little care is needed in interpretation.
More Lessons In This Unit
- Comparing representations of outcomes for more than two events Study Guide
- Comparing representations of outcomes for two events Study Guide
- Equally likely outcomes Study Guide
- Experiments to determine how likely an outcome is Study Guide
- Non-equally likely outcomes Study Guide
- Problem solving with possible outcomes Study Guide
- The scale of likelihoods Study Guide
- Using a Venn diagram to display outcomes for more than two events Study Guide
- Using a Venn diagram to display outcomes for two events Study Guide
- Using an outcome tree to display outcomes for more than two events Study Guide
- Using an outcome tree to display outcomes for two events Study Guide
- Using lists to display outcomes for more than two events Study Guide
- Using lists to display outcomes for two events Study Guide
Browse all guides in the Year 9 Maths guide library.