Probability: The chance that something will happen. How likely it is that some event will occur. 

Frequency tables: A table shows the distribution of data  

Two-way tables: are a type of frequency table used for organising data. It shows two categorical variables.

Frequency trees: are a way of organising information.  

Relative frequency: How often something happens divided by all outcomes.  

Mutually exclusive: Events that can't happen at the same time.   

Sample space: All the possible outcomes of an experiment. 

Independent Event: meaning each event is not affected by any other events.

Dependent Event: An event that is affected by previous events

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