You collect data. Flip a coin 100 times, you get 49 heads and 51 tails, so the probability of H is 0.49.
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Theoretical Probability is the measure of likelihood that an event will have a particular outcome.
The answer is probability.
Probability is the measure of how likely an event is. ... The probability of event A is the number of ways event A can occur divided by the total number of possible.
The relative frequency of of an event is one possible measure of its probability.
Probability is a numerical measure. Occasionally, though, it is expressed in words such as very likely or not at all likely. But these phrases are (or should be) based on the fact that probability itself is a number.