12: Probability Last updated Save as PDF Page ID 34253 David Lippman Pierce College via The OpenTextBookStore 12.1: Introduction to Probability The probability of a specified event is the chance or likelihood that it will occur. 12.2: Basic Concepts If you roll a die, pick a card from deck of playing cards, or randomly select a person and observe their hair color, we are executing an experiment or procedure. In probability, we look at the likelihood of different outcomes. 12.3: Working with Events 12.4: Bayes Theorem 12.5: Counting 12.6: Expected Value 12.7: Exercises