Calculatrice de Probabilité — Formule

How to Calculate Probability

Formula

P(event) = Favorable Outcomes / Total Outcomes

Probability ranges from 0 (impossible) to 1 (certain).

Odds

  • Odds in favor = favorable / unfavorable
  • Odds against = unfavorable / favorable

    • Exemple Résolu

    A bag has 10 marbles: 3 red, 7 blue. What is the probability of drawing a red marble?

    1. P(red) = 3 / 10 = 0.3
    2. As a percentage: 30%
    3. Odds in favor: 3 / 7 ≈ 0.4286
    4. Odds against: 7 / 3 ≈ 2.3333