Calculating theoretical probabilities from Venn diagrams (two events)
I can calculate and use theoretical probabilities for combined events using Venn diagrams (2 events).
Calculating theoretical probabilities from Venn diagrams (two events)
I can calculate and use theoretical probabilities for combined events using Venn diagrams (2 events).
These resources will be removed by end of Summer Term 2025.
Lesson details
Key learning points
- The probability of an outcome can be found by considering a Venn diagram showing all possible outcomes for two events.
- The probability of a set of outcomes can be found by using a Venn diagram showing all possible outcomes for two events.
- The probability of a set of outcomes can be found using a Venn diagram, even when the outcomes are not equally likely.
Keywords
Theoretical probability - A theoretical probability is a probability based on counting the number of desired outcomes from a sample space where all individual outcomes are equally likely.
Venn diagram - Venn diagrams are a representation used to model statistical/probability questions. Commonly circles are used to represent events.
Common misconception
Pupils may struggle with finding the probability of A or B, and may count the outcomes that belong to A and B twice.
If you use an example, such as visiting particular countries, ask the pupils how someone would respond to the question 'have you visited X or Y' if they have in fact visited both countries.
To help you plan your year 9 maths lesson on: Calculating theoretical probabilities from Venn diagrams (two events), download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your year 9 maths lesson on: Calculating theoretical probabilities from Venn diagrams (two events), download all teaching resources for free and adapt to suit your pupils' needs.
The starter quiz will activate and check your pupils' prior knowledge, with versions available both with and without answers in PDF format.
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The assessment exit quiz will test your pupils' understanding of the key learning points.
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Explore more key stage 3 maths lessons from the Probability: theoretical probabilities unit, dive into the full secondary maths curriculum, or learn more about lesson planning.
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Lesson video
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Starter quiz
6 Questions
Exit quiz
6 Questions
