If we throw a thumbtack onto a table once, we would have a hard time predicting whether the point would touch the surface of the table or not. But if we repeat this experiment many times, we will see that the number of times the point touches the surface divided by the number of throws will eventually stablize at a specific value.
Repeating a series of trials will produce similar, but not identical, results for each series. This observation is called statistical regularity.
This phenomenon has motivated the development of the relative frequency concept of probability. Most of the procedures commonly used to make statistical estimates or tests were developed by statisticians who used this concept exclusively. They are usually called frequentists.
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