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Probability Calculator
Probability of events and normal distribution
How It Works
Probability is the measure of the likelihood of an event occurring, quantified as a number between 0 and 1. This calculator computes probabilities for two events and for the normal distribution.
Probability is the measure of the likelihood of an event occurring, quantified as a number between 0 and 1, with 1 signifying certainty and 0 signifying impossibility. It follows that the higher the probability of an event, the more certain it is that the event will occur.
The complement of an event A, denoted P(A'), is the probability that A does not occur. The intersection P(A ∩ B) is the probability that both A and B occur. For independent events, this is simply P(A) × P(B). The union P(A ∪ B) is the probability that at least one of A or B occurs. The exclusive OR P(A XOR B) is the probability that exactly one of A or B occurs, but not both.
The normal distribution (Gaussian distribution) is a continuous probability distribution that is symmetric about the mean. It is widely used to describe variables that tend to cluster around the mean, such as heights, test scores, and measurement errors.
Results
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Quick Tips
- • Results update automatically as you type
- • Use Tab to navigate between fields
- • Press Enter to calculate