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Joint Probability Distribution

The table below shows the joint probability distribution between two discrete random variables - X and Y.

0 1 2
Y 3 0.1 0.2 0.2
4 0.1 0.2 0.2

In a joint probability distribution table, numbers in the cells of the table represent the probability that particular values of X and Y occur together. From this table, you can see that the probability that X=0 and Y=3 is 0.1; the probability that X=1 and Y=3 is 0.2; and so on.

See also:  Independent vs Dependent Random Variables