CHANCE - a possibility of something happening.

Event - a thing that happens or takes place, especially one of importance.

RANDOM - made, done, or happening without method or conscious decision.

PREDICTABLE - An expected result

Sample Space  - he sample space of an experiment or random trial is the set of all possible outcomes or results of that experiment.

Bias -  Bias, prejudice mean a strong inclination of the mind or a preconceived opinion about something or someone. A bias may be favorable or unfavorable: bias in favor of or against an idea.

Outcome - an outcome is a possible result of an experiment or trial. Each possible outcome of a particular experiment is unique, and different outcomes are mutually exclusive. All of the possible outcomes of an experiment form the elements of a sample space