Problème sur les probabilités


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Indication : on pourra approximer le problème par une loi de Poisson Exercice 45 Une personne sur 100 fait des probabilités pour s'amuser Parmi n personnes 

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Déterminer la loi de probabilité de X, son espérance et son écart-type. Faisons un produit en croix : 6 = n² + 3n + 2, ce qui revient à résoudre l'équation n² + 3n – 4 = 0. Cette solution étant négative, elle ne peut convenir au problème posé. Il faut donc que n soit égal à 1.

Quelle est la probabilité d'un événement impossible ?

Un évènement impossible est un évènement qui ne se produira jamais, que l'on est certain de ne pas avoir. La probabilité d'un évènement impossible (A) est toujours égale à 0 ou 0% (P(A)=0 P ( A ) = 0 ).

Comment faire pour comprendre les probabilités ?

Pour un évènement, une probabilité est égale au rapport entre le nombre de résultats favorables et le nombre de résultats possibles de l'expérience aléatoire.
. On peut exprimer une probabilité à l'aide d'une fraction, d'un nombre décimal ou d'un pourcentage.

Quels sont les types de probabilités ?

Divisez 11 (nombre de résultats favorables) par 20 (nombre total de résultats possibles) et vous aurez votre probabilité.
. Dans notre exemple, la probabilité de tirer une bille blanche est de 11/20.
. Si vous faites la division, cela donne : 11 ÷ 20 = 0,55, soit 55 %.










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