A probability mass function (PMF) is a function that gives the probability of each possible value for a discrete random variable. It summarizes the distribution of probabilities for all outcomes in a way that the sum of all probabilities equals one, providing a complete description of how probabilities are distributed across discrete outcomes. Understanding PMFs is essential when dealing with discrete probability distributions, as they highlight how likely different values are and form the basis for calculating joint, marginal, and conditional distributions in the context of multiple variables.
congrats on reading the definition of Probability Mass Function. now let's actually learn it.