Suppose with for all . Let us cross-classify the points or simple events in S by forming a row partition and a column partition as indicated in Fig. 4.7. Here is the number of simple events in row and column j, with We can now define the following probabilities:

a. Joint Probability: Considers the probability of the simultaneous occurrence of two events, that is,

b. Marginal Probability: Used whenever one or more criteria of classification are ignored (we can ignore either the row or column partition), that is,

c. Conditional Probability ...

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