In mathematics and statistics, a probability vector or stochastic vector is a vector with non-negative entries that add up to one. The positions (indices) of a probability vector represent the possible outcomes of a discrete random variable, and the vector gives us the probability mass function of that random variable, which is the standard way of characterizing a discrete probability distribution.
Definition 2:-
A probability vector is a vector (a column or row matrix) which is non-negative and all elements adding upto unity. The elements of a probability vector represent the possible outcomes of a discrete random variable and the vector as a whole represents the probability mass function of that random variable. Probability vector is a convenient, compact notation for denoting the behaviour of a discrete random variable.
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