Basic Probability Notation: Joint Probability Distributions

• Probability of every possible combination of atomic events.

• P(Cavity or Toothache) = 0.04 + 0.01 +0.06 = 0.11

• P(Cavity|Toothache) =
  P(Cavity and Toothache)/P(Toothache) =
  0.04/(0.04 + 0.01) = 0.80.

• That's a big table!