Equally likely outcomes

I can state when outcomes will be equally likely.

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Year 9

Equally likely outcomes

I can state when outcomes will be equally likely.

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Share activities with pupils

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Lesson details

Key learning points

A set of possible outcomes can be stated.
Outcomes can be evaluated to decide how likely they are.
Outcomes with the same likelihood can be identified.

Keywords

Outcome - An outcome is a result of a trial.
Likelihood - Likelihood describes the chance that a particular event will occur.
Trial - A trial is a single predefined test.
Sample space - A sample space is all the possible outcomes of a trial. A sample space diagram is a systematic way of producing a sample space.

Common misconception

Rolling a 6 on a dice is less likely to happen than rolling other numbers. Or ticket 001 is less likely to be drawn in a raffle than other tickets.

The random nature of picking a raffle or rolling a dice means all outcomes are equally likely as each other.

To help you plan your year 9 maths lesson on: Equally likely outcomes, download all teaching resources for free and adapt to suit your pupils' needs...

Ask pupils to design a their own single-trial game where the likelihoods of winning and losing are equal.

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Licence

This content is © Oak National Academy Limited (2025), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).