Résolution d'un problème : les probabilités


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Comment résoudre des probabilités ?

La probabilité que "A ou B" se réalise s'obtient en additionnant la probabilité de A avec celle de B et en retirant la probabilité de "A et B" (qui a été compté deux fois, une fois dans les cas de A et une fois dans les cas de B) Donc : P(A ou B) = P(A) + P(B) - P(A et B)

Quels sont les formules dé probabilité ?

La formule pour calculer une probabilité conditionnelle est : P(B?A)=P(B?A)P(A) P ( B ? A ) = P ( B ? A ) P ( A ) où P(B?A) P ( B ? A ) représente la probabilité de l'intersection des deux événements.
. De plus, il est nécessaire que P(A)>0 P ( A ) > 0 .

Comment comprendre un exercice dé probabilité ?

= P(A) + P(B) – P(A – B) C'est-à-dire que la probabilité que l'un ou l'autre des deux événements se produise est égale à la probabilité que le premier événement se produise, plus la probabilité que le second se produise, moins la probabilité que les deux se produisent.

Comment calculer une probabilité à partir d'un tableau ?

Les probabilités conditionnelles peuvent être déterminées directement à partir de tableaux à double entrée.
. On peut également utiliser la formule de probabilité conditionnelle, �� ( �� ? �� ) = �� ( �� ? �� ) �� ( �� ) , où �� ( �� ? �� ) est la probabilité que �� et �� se produisent simultanément.










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