It is called the probability of the set of outcomes!
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The probability depends on the nature of the outcomes in the set: whether or not they are mutually exclusive, independent.
Experimental or empirical probability.
A set of outcomes are called results. All possible outcomes are referred to as the sample space.
The probability of whatever it was that happens.
Probability determined as part of an experiment is called experimental probability. Probability determined by analysis of all of the possible and expected outcomes is called theoretical probability.