Calculateur de Probabilité Conditionnelle — Formule

How to Calculate Conditional Probability

Formula

P(AB) = P(A and B) / P(B)

Conditional probability measures how the probability of event A changes when we know event B has occurred. The vertical bar "" is read as "given". P(B) must be greater than zero.

Exemple Résolu

P(A and B) = 0.12 and P(B) = 0.4. Find P(A|B).

  1. P(A|B) = P(A and B) / P(B)
  2. P(A|B) = 0.12 / 0.4
  3. P(A|B) = 0.3
  4. As a percentage: 30%