The table below gives some examples of events and how their probability can be calculated.
|Event||Outcome||Number of ways to get this outcome||Total number of possible outcomes||Probability of outcome|
|Throwing a fair, 6-sided die||Getting an odd number|
|Throwing a fair coin||Getting 'tails'|
|Choosing a playing card from a full pack without looking||The suit being spades|
|Choosing a playing card from a full pack without looking||The card being a 'ten'|
|Throwing a fair, 6-sided die||Getting a number less than|
You may sometimes need to list all the possible outcomes of an event.
The key is to work systematically - do not just list all the outcomes randomly.
Here is an example:
Imagine that you had to find all the different orders in which three people (Anita, Benita and Carol) could finish in a race.
The first step (to save you writing too much) is to label the people A, B and C - but make sure you mention this.
Jot down the different orders in which Anita, Benita and Carol could finish.
ABC, ACB, BCA, BAC, CAB, CBA
Make sure you can 'see' the pattern in the order of choices.