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The frequentist approach restricts our attention to phenomena that are inherently repeatable under essentially the same conditions. We call each repetition an experiment and assume that each experiment may or may not give the event . The experiment is repeated times as we count the number of the experiments that end up in the event . The relative frequency of is defined as

Because the conditions are the same for all experiments, the relative frequency approaches a limit when . This limit is called the probability of and is denoted by

(2.2)

If we do a single experiment, we say that the probability of getting the outcome is and consider this probability a property of the experiment.