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An event which has a probablility of 1 is one that will definitely happen. Probabilities range between 0 and 1 (0% and 100%) with a probability of zero meaning it is impossible and a probability of one meaning that it is definite. i.e. winning the lottery if you never play has a probability of zero and winning the lottery if you know the correct numbers in advance has a probability of one.

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Q: What event has a probability of 1?
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Continue Learning about Statistics

What does it mean to find the compliment of the probability of an event?

The complement (not compliment) of the probability of event A is 1 minus the probability of A: that is, it is the probability of A not happening or "not-A" happening.The complement (not compliment) of the probability of event A is 1 minus the probability of A: that is, it is the probability of A not happening or "not-A" happening.The complement (not compliment) of the probability of event A is 1 minus the probability of A: that is, it is the probability of A not happening or "not-A" happening.The complement (not compliment) of the probability of event A is 1 minus the probability of A: that is, it is the probability of A not happening or "not-A" happening.


What is the probibility of 1 mean?

A probability of 1 refers to an event that is certain to happen.A probability of 1 refers to an event that is certain to happen.A probability of 1 refers to an event that is certain to happen.A probability of 1 refers to an event that is certain to happen.


How do you find the probability of the complement of an event?

The probability of the complement of an event, i.e. of the event not happening, is 1 minus the probability of the event.


What is the probability of an event occurring to the probability that it will not occur?

The probability that an event will occur plus the probability that it will not occur equals 1.


Can -1.5 be the probability of an event?

No. The probability of an event ranges from 0 (the event will not happen) to 1 (the event will happen).