The probability of an event that is certain to happen is 1.
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NO!!! In probability P(0) = Event will NOT happen/occur P(1) - Event is certain to occur. Probability answers less than zero, or greater than '1' are incorrect.
The number 1. The area of any probability distribution equals 1.
Experimental probability is the number of times some particular outcome occurred divided by the number of trials conducted. For instance, if you threw a coin ten times and got heads seven times, you could say that the experimental probability of heads was 0.7. Contrast this with theoretical probability, which is the (infinitely) long term probability that something will happen a certain way. The theoretical probability of throwing heads on a fair coin, for instance, is 0.5, but the experimental probability will only come close to that if you conduct a large number of trials.
The probability of that event.
The probability of rolling a number less than 1 on a standard 6-sided die is zero. It will not happen.