Probability Mass Function (PMF) for Discrete Distributions
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Applied Statistics and Probability for Engineers, Douglas C. Montgomery, George C. Runger, 2018 (John Wiley & Sons) - A foundational text covering applied probability and statistics, with clear explanations of discrete distributions and the probability mass function for engineering and scientific applications.
Introduction to Probability and Statistics (18.05), Jeremy Orloff, Jonathan Bloom, 2014 (MIT OpenCourseWare) - Online course materials from a highly-regarded university course, offering lectures and resources on probability, including discrete random variables and their PMFs.