Possible outcomes
The possible results from an event
Sample Space
A list or diagram that shows the possible outcomes of two or more events
Independent events
An event whose outcome is not affected/influenced by what has occurred before
Mutually exclusive events
Events that can't happen at the same time
Combined events
One event followed by another event
Favourable combinations
Any outcomes that mean a desired event has occurred
What are tree diagrams and venn diagrams useful for?
Organising the outcomes of different stages in an event
For independent events you find the probability by
multiplying the probabilities on each branch of the tree; P(A and then B) = P(A) x P(B)
When events are mutually exclusive
add the probabilities obtained by multiplication
Conditional Probability
the probability that an event happens, given that another event has already happened