It is doing a trial again and again and recoding the outcomes. For example tossing a coin and recording whether the coin came up heads or tails, or driving along a road to a specific set of traffic lights and recoding whether the lights were red or green (or amber)..
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The relative frequency of an event, from repeated trials, is the number of times the event occurs as a proportion of the total number of trials - provided that the trials are independent.
It is the probability of an event calculated from repeated trials of an experiment.
Repeated trials.
It is empirical (or experimental) probability.
The probability that is based on repeated trials of an experiment is called empirical or experimental probability. It is calculated by dividing the number of favorable outcomes by the total number of trials conducted. As more trials are performed, the empirical probability tends to converge to the theoretical probability.