probability

• an experiment is a repeatable process that gives rise to a number of outcomes
• an event is a collection of one or more outcomes
• a sample space is a set of all possible outcomes
• where outcomes are equally likely the probability of an event is the number of outcomes in the event divided by total number of possible outcomes
• all events have a probability between 0 and 1
• probabilities are wrote as a fraction or a decimal
• veen diagrams can be used to represent events graphically
• frequencies or probabilities can be placed in regions of venn diagrams