Year 9 - Maths
Comparing representations of outcomes for more than 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 identify the same outcome across all the different representations.
Key Notes
- Fluency in moving between the representations is important.
- Sometimes it is better to display the outcomes using a particular representation.
Vocabulary To Learn
- Outcome table: An outcome table is a table that shows all the possible outcomes.
- Tree diagram: Tree diagrams are a representation used to model statistical/probability questions. Branches represent different possible events or outcomes.
- Outcome tree: Each branch of an outcome tree shows a possible outcome from an event or from a stage of a trial. The full outcome tree shows all possible outcomes.
- Venn diagram: Venn diagrams are a representation used to model statistical/probability questions. Commonly circles are used to represent events.
Common Mistakes To Avoid
- I can use outcome tables to categorise outcomes into as many events as I want.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
Fluency in moving between the representations is important. Sometimes it is better to display the outcomes using a particular representation.
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: I can use outcome tables to categorise outcomes into as many events as I want. Correction: Outcome tables are limited to categorising outcomes into only two events. You can use more tables to categorise outcomes into three or more events, but the number of tables you need quickly becomes massive!
More Lessons In This Unit
- 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
- Using two-way tables to display outcomes for two events Study Guide
Browse all guides in the Year 9 Maths guide library.