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

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Q: How do you find the probability of the complement of an event?
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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 relationship between the probability of a simple event and its complement?

If the probability of an event is p, then the complementary probability is 1-p.


If the probability of an event is 0.42 then what is the probability of its component?

I haven't heard of a component with regards to statistics. If, by chance, you are referring to the complement, it is the probability that the event does not occur. In this case, the complement would be 0.58.


If the probabilty that an event will happen is 3 what is the probability of the event complement?

The probability of event X is 0.3. If events X and Y are complements, what is the probability of event Y?


How often is the probability of the complement of an event less than the probability of the event itself?

It depends on the events. The answer is 0.5*(Total number of events - number of events with probability = 0.5) That is, discount all events such that their probability (and that of their complement) is exactly a half. Then half the remaining events will have probabilities that are greater than their complement's.