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Student Resources

Glossary

Conditional probability    
The probability of an event happening, given that another event has already happened.

probability of B given A equals the probability of B given A = the probability of event B happening given that event A happens

Dependent event   
An event that is affected by a previous event. The outcome of the event is affected by the outcome of the previous event.

Experimental probability 
The ratio of the number of times an event occurs to the total number of trials or times the activity is performed. It is the estimate of an event occurring, based on the results of observations or results of an experiment.

Independent event
An event that is not affected by a previous event. The outcome of the event is not affected by the outcome of the previous event.

Theoretical probability
The number of ways that the event can occur, divided by the total number of outcomes.