Q: What does complement mean in probability?

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"one third" is not an event and so cannot have complement nor a probability.

With the information that is available from the question, it is impossible.

It is not necessary. Sometimes, though, it is easier to find the probability of the complement and subtract that probability from 1.

The complement involves probability. Say the probability of choosing a red marble was 3/10. So the complement, or the chance of not choosing a red marble is 7/10. Think of it as the opposite of the probabilty. You simply subtract the numerator from the denominator and you have the complement. (10-3=7 in this case, then you would put your difference over the probabilities denominator, so it would be 7/10.)

Read the introduction to probability and probability measures at StatLect.com

Related questions

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.

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

Determinism.

"one third" is not an event and so cannot have complement nor a probability.

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.

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.

The probability of not a is the same as the complement of a, which is found by subtracting the probability of a from one (i.e., P(not A)=1-P(A)).

With the information that is available from the question, it is impossible.

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

The probability of something NOT happening is the complement of the probability of something happening. Since the probability that you DO have 3 heads is 1/8 (that is, 1/2 cubed), the complement is 1 - 1/8 = 7/8.

0.94

0.97. Just take it away from 1