  # Outcomes and Probability (1)

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

Curriculum topic:   Probability

Curriculum subtopic:   Calculate Theoretical Probability

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.

Make carefully organised, systematic lists when determining all the outcomes.  Do not just write out the outcomes randomly.

### What is EdPlace?

We're your National Curriculum aligned online education content provider helping each child succeed in English, maths and science from year 1 to GCSE. With an EdPlace account you’ll be able to track and measure progress, helping each child achieve their best. We build confidence and attainment by personalising each child’s learning at a level that suits them.

Get started 