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🎲intro to statistics review

Event

Written by the Fiveable Content Team • Last updated September 2025
Written by the Fiveable Content Team • Last updated September 2025

Definition

An event is a specific outcome or a set of outcomes of a random experiment. Events are subsets of the sample space.

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5 Must Know Facts For Your Next Test

  1. Events can be simple (single outcome) or compound (multiple outcomes).
  2. The probability of an event is always between 0 and 1, inclusive.
  3. Mutually exclusive events cannot occur at the same time.
  4. The complement of an event A, denoted as A', represents all outcomes not in A.
  5. For any two events A and B, the union (A ∪ B) represents outcomes in either A or B or both.

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