The Economic Approach to Human Behavior by Gary Becker, Chapter 1
Reading Guide: The Economic Approach to Human Behavior
Yale stats department notes on random variables
Yale stats department notes on probability distributions
Charles M. Grinstead and J. Laurie Snell’s Introduction to Probability (a whole stats textbook)
Joseph K. Blitzstein and Jessica Hwang’s Introduction to Probability (another whole stats textbook)