Discrete Probability Distributions
- The probability distribution for a discrete random variable is a description all the possible values of the random variable, and its corresponding probability.
- Since it is discrete (means there is supposedly/usually a finite number of outcomes), we can express the probability distribution in a table.
- We can describe the probability distribution with the function
where X is the random variable and x is the corresponding values.
- The function above is called a discrete probability function or a probability mass function (pmf).