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Incompréhension Loi de proba Poisson


Mr-Bean
Go to solution Solved by Dradeliomecus,

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Bonjour, bonjour

J'ai du mal avec cet exemple de la prof. En effet je comprends que lambda=np mais c'est sur le 2ème point que je bloque.

Lorsque on a 1-P(X=0) je pige pas pourquoi elle trouve e(5/4). Si on prend sa formule pour une loi de poisson P(X=k)= [e(-lambda)x lambda k]/k!) 

--> si x = 0 alors le calcul est impossible non? on divise pas par 0

 

Merci

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