An outcome is impossible if there is no possibility that it can happen.

An outcome is certain if it is guaranteed to happen.

An outcome has even chance if its likelihood of happening is the same as its likelihood of not happening.

The scale of likelihoods

Maths

Equally likely outcomes

Non-equally likely outcomes

Experiments to determine how likely an outcome is

Using lists to display outcomes for two events

Using two-way tables to display outcomes for two events

Using an outcome tree to display outcomes for two events

Using a Venn diagram to display outcomes for two events

Comparing representations of outcomes for two events

Using lists to display outcomes for more than two events

Using an outcome tree to display outcomes for more than two events

Using a Venn diagram to display outcomes for more than two events

Comparing representations of outcomes for more than two events

Problem solving with possible outcomes

In this unit, pupils learn techniques for systematically listing all of the possible outcomes for both one event and two events. In the future unit, pupils use lists of outcomes to find theoretical probabilities

In this unit, pupils find all the factors of a number systematically and they understand that systematic listing is helpful in organising their work. The idea of being systematic is built on in this unit as pupils work to identify all possible outcomes

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.

Probability: possible outcomes

An outcome is __________ if there is no possibility that it can happen.

An outcome has less chance of happening than not happening.

An outcome has the same chance of happening as not happening.

An outcome has a greater chance of happening than not happening.

Which statement describes the meaning of 'even chance'?

Match the words with their positions on the scale of likelihoods.

Match each event with the term that describes their likelihood.

A bag contains counters that are each labelled with a letter from A to C. One counter is chosen at random from the bag. Which term describes the likelihood of choosing the letter 'A'?

A regular six-sided dice is rolled. Starting with the least likely, sort the events in increasing order of likelihood.

__________ describes the chance that a particular event will occur.

The most likely outcome is for it to land on 'lose'.

The most likely outcome is for it to land on 'win'.

The two outcomes are equally likely to happen.

Which statement is true for this spinner?

Which letter is this spinner most likely to land on?

Starter Quiz

__________ describes the chance that a particular event will occur.