A branch of Mathematics that measures the likelihood that an event will occur. The theory of probability was first developed by Blaise Pascal in the 17th cent. as a means of solving gambling problems. Later Pierre LaPlace contributed to wit: Given an experiment (Example: a coin toss), each possible outcome is assigned a number, called a probability measure, that corresponds to its chance of occurring.

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http://www.peterwebb.co.uk/probability.htm
Last Updated 06.21.04