Year 9 - Maths
Experiments to determine how likely an outcome is
Probability: possible outcomes
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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 determine the likelihood of an outcome by designing and carrying out an experiment.
Key Notes
- An experiment can be designed to determine how likely an outcome is.
- An experiment can be carried out and the outcomes recorded.
- The outcomes can be considered and the likelihood of each outcome stated.
Vocabulary To Learn
- Experiment: An experiment is a repetition of a trial multiple times in order to observe how often each outcome occurs.
Common Mistakes To Avoid
- A small number of trials in an experiment is enough to provide conclusive findings.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
An experiment can be designed to determine how likely an outcome is. An experiment can be carried out and the outcomes recorded.
2. Use this key word in a maths sentence and explain it clearly. 'Experiment'
An experiment is a repetition of a trial multiple times in order to observe how often each outcome occurs. Use this word when showing your method, then check your final answer is reasonable.
3. Spot and fix this common maths mistake.
Mistake: A small number of trials in an experiment is enough to provide conclusive findings. Correction: Even in situations where we know that the different outcomes of a trial are equally likely happen, one outcome may happen more often than the others. E.g. when we flip a coin 10 times, we don't always get the exact same number of heads and tails.
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
- 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.