1. Definiton

An experiment involves chance or probability. It can lead to many events. Each event leads to an outcome. An outcome is the result of a single trial of an experiment. Probability measures how likely an event could happen.

2. Example:

Tossing a coin is an experiment. Getting a head or a tail are the events. The event "head" is an outcome; the event "tail" is the second outcome. The probability that an outcome is a tail measures 1/2 (the same value for the head outcome).