An event that will definitely happen is an event with 100% probability.
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Probabilities go from 0 to 1. 1 means the event will definitely happen. 0 means it's impossible for it to happen. 0.5 means it's just as likely to happen as not. Once you are aware of this scale, it is clear that an event with probability 0.95 is more likely to happen than an event with probability 0.10.
No. The probability of an event ranges from 0 (the event will not happen) to 1 (the event will happen).
If the event will definitely occur, then its probability is 1.Not asked, but answered for completeness sake - if the event will definitely not occur, then its probability is 0. All probabilities lie between 0 and 1, inclusive.
The probability of an event that is certain to happen is 1.
The total probability of something happening plus the probability of that same thing not happening is 1, or 100 % → probability of not happening = 1 - 0.25 = 0.75 or 100 % - 25 % = 75 %