Problèmes de (Loi de) probabilités


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PDF Deux problèmes du Calcul des Probabilités

Mesures de dépendance entre événements fortuits 1 -~ On dit généralement qu'on a affaire à une loi de probabilité lorsqu'une même expérience peut fournir 

  • Quelle est la loi de probabilité de P ?

    Une loi de probabilité est une distribution théorique de fréquences.
    Soit Ω un ensemble muni d'une probabilité P.
    Une variable aléatoire X est une application définie sur Ω dans ℝ.
    X permet de transporter la loi P en la loi P' définie sur Ω′=X(Ω) : on a P′(xj)=P(X1(xj))=P(X=xj).

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Comment déterminer la loi d'une probabilité ?

Définition : Soit une variable aléatoire X définie sur E et prenant les valeurs x1,x2,, xn. La loi de probabilité de X associe à toute valeur xi la probabilité pi = P(X = xi).

Quelles sont les lois de la probabilité ?

Une loi de probabilité est une distribution théorique de fréquences.
. Soit ? un ensemble muni d'une probabilité P.
. Une variable aléatoire X est une application définie sur ? dans ?.
. X permet de transporter la loi P en la loi P' définie sur ??=X(?) : on a P?(xj)=P(X?1(xj))=P(X=xj).

Comment calculer la probabilité de la loi de Poisson ?

La loi de Poisson se définit par une formule assez compliquée. E[X] = ? ? (X) = ? ?.
. C'est la seule LOI connue qui ait toujours son espérance égale à sa variance.

Comment trouver lambda loi de Poisson ?

Par exemple, si un certain type d'événements se produit en moyenne 4 fois par minute, pour étudier le nombre d'événements se produisant dans un laps de temps de 10 minutes, on choisit comme modèle une loi de Poisson de paramètre ? = 10? = 40.










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