If you can enumerate the outcome space into equally likely events, then it is the number of outcomes that are favourable (in which the event occurs) divided by the total number of outcomes.
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The formula for finding probability depends on the distribution function.
You need to know the probability of the event in question. Then the expected frequency for that event occurring is that probability times the number of times the experiment was repeated.
Expected successes= Theoretical Probability · Trials P(event) = Number of possible out comes divided by total number of possible
Probability of event = relative frequency = f/nf is the frequency of the event occurence in a sample of n observances.
The event E must be well defined.