  # List the Probability of Outcomes

In this worksheet, students will determine the possible outcomes of two events. Key stage:  KS 3

Curriculum topic:   Probability

Curriculum subtopic:   Calculate Theoretical Probability

Popular topics:   Probability worksheets

Difficulty level:   #### Worksheet Overview

When two events occur, there are several possible outcomes.

For example, when a coin is thrown, it can land heads up (H) or tails up (T). So when two coins are thrown, the possible outcomes are:

H   H

H   T

T    H

T    T

There are four possible outcomes.

So the probability of getting two heads, P(HH) = 1/4

The probability of getting one head, P(H) = 2/4 = 1/2 because we can either have HT, or TH.

Let's get started on the questions now.

It's important to make carefully organised, systematic lists when determining all the outcomes and not just write out the outcomes randomly.

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