Statistics Calculators: [ Ссылка ]

The addition law can be used to calculate the probability of the union of two events. It says that the probability of the union of two events is the sum of their probabilities minus the probability of their intersection. The reason that the intersection is subtracted in the addition law is that when summing the probabilities, the intersection is counted twice. Events are said to be mutually exclusive if they have no sample points in common. If they have no sample points in common, then there intersection is empty and thus the probability of their intersection is zero. So the addition law for mutually exclusive events will simple be the sum of the probabilities of the events.

0:00 Introduction
3:40 Mutually Exclusive

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