probability
Sign in to savethumb|250px|The probabilities of rolling several numbers using two dice
AI overview
Probability is a way of measuring how likely something is to happen, expressed as a number between 0 (impossible) and 1 (certain). It matters because it helps us understand uncertainty in everyday situations—from weather forecasts to medical tests to games—and allows us to make better decisions when we don't know what will happen next.
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Article
18 sectionsContents
- Etymology
- Interpretations
- History
- Theory
- Applications
- Mathematical treatment
- Independent events
- Mutually exclusive events
- Not (necessarily) mutually exclusive events
- Conditional probability
- Inverse probability
- Summary of probabilities
- Relation to randomness and probability in quantum mechanics
- See also
- Notes
- References
- Bibliography
- External links
thumb|250px|The probabilities of rolling several numbers using two dice
Probability concerns events and numerical descriptions of how likely they are to occur. The probability of an event is a number between 0 and 1; the larger the probability, the more likely an event is to occur. This number is often expressed as a percentage (%), ranging from 0% to 100%. A simple example is the tossing of a fair (unbiased) coin. Since the coin is fair, the two outcomes ("heads" and "tails") are both equally probable; the probability of "heads" equals the probability of "tails"; and since no other outcomes are possible, the probability of either "heads" or "tails" is 1/2 (which could also be written as 0.5 or 50%).