# What is probability

probability

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*probability*(English: probability) is a measure to quantify the certainty or uncertainty of the occurrence of a certain event in the context of a Â»random experimentÂ«. There are different opinions in the literature on how to determine the probability empirically:

- The
*classic*The concept of probability by Pierre-Simon Laplace (1749-1827) defines probability as the quotient of the number of favorable and equally possible cases. - The
*statistical*Richard von Mises' (1883-1953) concept of probability defines probability as the limit value of the relative frequency of occurrence of the event. - The
*subjective*The concept of probability by Leonard J. Savage (1917-1971) defines probability as the subjectively perceived chance of betting.

- A probability is a number between 0 and 1 (including the two limits).
- An event that always occurs, the so-called
*safe*Event, has the probability 1. - Close two events and off, corresponds to the probability that either the event or the event occurs, the sum of the two individual probabilities.

*notation*: is the probability of the event . is the conditional probability of the event provided that event has occurred.

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