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Outcomes and Probability (1)

In this worksheet, students determine the possible outcomes of two events.

'Outcomes and Probability (1)' worksheet

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.

 

 

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