table loi normale centrée réduite negative


  • Comment lire table de la loi normale centrée réduite ?

    La table de la loi normale centrée réduite donne les valeurs de la probabilité de la variable aléatoire normale centrée réduite. La variable normale centrée réduite est une variable aléatoire continue de moyenne �� = 0 et d'écart-type �� = 1 . On désigne cette variable par �� . On note donc �� ? �� ? 0 ; 1 ? ? .
  • Comment centrer et réduire loi normale ?

    Pour centrer et réduire la loi normale, on soustrait d'abord �� = 1 0 5 de chaque côté. Puis, on divise chaque côté par �� = 3 . Enfin, on remplace par �� le terme �� ? �� �� : �� ( �� < 1 0 5 ) = �� ( �� ? �� < 0 ) = �� ? �� ? �� �� < 0 ? = �� ( �� < 0 ) .
  • Comment utiliser la table de la loi normale ?

    Si le signe de Z est positif cela signifie que l'on se situe à 2.5 ? à droite de la moyenne. Si on lit la valeur sur la table correspondant à 2.5 sur la deuxième page, on trouvera une probabilité de 0.9938. La valeur de 0.9938 correspond à la probabilité associée à toutes les valeurs inférieures à 25.
  • Pour le calcul de P (X ? a) dans le cas ou X suit une loi N (?, ?²) : On utilise la propriété suivante : Si x ? ?, on utilise P (X ? x) = 0,5+ P (? ? X ? x). Si x ? ?, on utilise P (X ? x) = 0,5- P (x ? X ? ?).
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