Probability – Notes
A Theoretical Approach
Experimental probability is based on the observations of an experiment.
Experimental probability gets closer to the theoretical probability as the number of observations increases.
Theoretical probability of an event E, P(E) =
The possible outcomes of an experiment are called its elementary events.
The sum of the probabilities of all elementary events of an experiment is always one.
Two events that are mutually exclusive of each other are called complimentary events.
The sum of probabilities of two complimentary events is always equal to one.
An event having zero probability of occurrence is called an impossible event.
An event having a probability of 1 is called a sure or certain event.