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Probability Mass Function

X is random variable x₁, x₂,....,x_n are its values and f₁, f₂,....,f_n are their corresponding frequencies and N is the total number of random experiment in sample space. The probability of x_i is denoted by P(x=x_i) and defined as P(x=x_i) = f_i / N, where

Now, the function P(x=x_i) defined as above is called the "Probability Mass Function"

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