Also known as Marginal Probability, Probability, as the name suggests, is an estimate of how likely an event might take place. It is simply a number that reflects the likelihood that an event will take place. It could be a number between 0 and 1 or it could be expressed as a percentage value. Join us tomorrow Saturday 18th September from 11:00 am as we take it step by step. We will define an Experiment within the context of Probability Theory — a branch of mathematics dealing particularly with probability. An Experiment is defined as a procedure which, although can be repeated infinite number of times, still has a well-defined set of possible outcomes.