Year 9 · Maths · beta

Probability: theoretical probabilities

In this unit we build upon the concept of likelihood to work more mathematically with more measurable probability using fraction and decimal representations to both interpret and calculate. We revisit and develop ways to represent and compare probabilities.

This is an attributed Oak National Academy lesson sequence, not a completed or academically approved DASKEREL course. Supporting transcripts may depend on video, images, practical equipment or teacher explanation. Follow each lesson’s supervision guidance. For religious education and RSHE, follow the school’s syllabus, policy and safeguarding procedures.

Prior knowledge

  • Define probability as a ratio between favourable and possible outcomes
  • Represent events using lists, tables or diagrams
  • Calculate probabilities of single and combined events

Source curriculum references

  • Record, describe and analyse the frequency of outcomes of simple probability experiments involving randomness, fairness, equally and unequally likely outcomes, using appropriate language and the 0-1 probability scale
  • Understand that the probabilities of all possible outcomes sum to 1
  • Generate theoretical sample spaces for single and combined events with equally likely, mutually exclusive outcomes and use these to calculate theoretical probabilities

Oak source metadata. DASKEREL has not independently verified school-level coverage.

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