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"The probability P(E) of an event E is a real number in the range of 0 to 1. The probability of an impossible event is 0 and that of an event certain to occur is 1."
The Law of Total Probability states that P(A + B) is the probability that either A or B occur alone or that both occur together.
P(A + B) can be computed from: P(A + B) = P(A) + P(B) – P(A, B), where
- P(A) = the probability that A occurs,
- P(B) = the probability that B occurs, and
- P(A, B) = the probability that both A and B occur simultaneously.
See Also
- Try the Mean calculation
- Try the Median calculation
- Try the Mode calculation
- Here's the Range of a data set
- Here's the Min calculation
- And the Max calculation
- Standard Deviation (Sample)
- Standard Deviation (Population)
- Frequency Distribution between min and max
- Frequency Distribution for population
- Try the z-score calculation on your data set
- Try the z-score when you know both mean and SD
- Law of Total Probability
- Conditional Probability of B given A
- Probability of Equally Likely Events
