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What is the meaning of a random variable X~[ a matrix] in mathematical probability theory for postgraduate entrance examination? thank you
You should be talking about a two-row matrix, right? The first row of the matrix represents the possible values of the variable X.
The second row corresponds to the probability that x takes the value of the corresponding position in the first row.
such as
X~ (0 1
1/2 1/2 )
It means that the probability that X is 1 or 0 is 1/2.