 |
Download a pdf copy of this help file here |
|
Download a pdf copy of this help file here |
See also: Probability rules and diagrams introduction
The following notation is developed from set theory and is used extensively to represent probabilities of events and their relationships.
|
The probability that event A occurs |
|
The
probability that event A does not occur. AC
is called the compliment of A. |
|
The probability that events A and B both occur |
|
The probability that either events A or B occur |
|
The probability that event A occurs given that event B has occurred |
|
The
null event, i.e. impossibility so, for example |
|
The probability of all events Ai occurring |
|
The probability of any event Ai occurring |
|
e is the set of all possible things (i.e. anything), so P(e) = 1 |
Read on: Basic probability rules
or 
and 
