0
p = 1
For example in popular language:
An event certain to occur is that the sun will rise each day. The probability of the sun rising is 100%.
But, as you are well aware, it's not the sun rising but the earth turning and it's only going to happen for another 10 billion years.
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What is the likelihood a certain event will occur?
Its probability. The probability for a certainty is 1.
What is the number that describes the likelihood a certain event will occur?
The probability of that event.
What do you mean by probability?
Probability is a measure of the expectation that an event will occur or a statement is true. Probabilities are given a value between 0 (will not occur) and 1 (will occur).[1] The higher the probability of an event, the more certain we are that the event will occur.
An event that must occur has 1 for probability?
Yes. It is a certain event. If a coin is tossed, a 'head or tail would roll' is a certain event and has probability 1.
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.
