Theoretical Probability

• If each outicome in an experiment has the same chance of occuring as any other outcome, the outcomes are eqully likely
• P(E) = number outcomes in E/number of possible outcomes.
• Some facts
  • If an even E can not occur P(E) = 0
  • If an event E must occur P(E) = 1
  • For every event 0 ≤ P(E) ≤ 1
  • The sum of probabilities of all possible outcomes for an experiment is 1.
  • P(E) + P(not E) = 1
• Do some problems P 687