Chapter 14: Probability

Introduction to Probability

What is Probability?

Probability measures how likely an event is to occur.

Key Terms

TermMeaning
ExperimentActivity with uncertain outcome
TrialOne performance of experiment
OutcomeResult of a trial
EventCollection of outcomes
Sample SpaceAll possible outcomes

Examples

Coin Toss:

  • Sample Space = {Head, Tail}
  • P(Head) = 1/2

Die Roll:

  • Sample Space = {1, 2, 3, 4, 5, 6}
  • P(Even) = 3/6 = 1/2