Summers Deleon
10/12/2023 · Elementary School

de \( \begin{array}{l}\text { Arrondir à } 10^{-4} \\ \text { 1. Quelle est la probabilité } p \text { d'obtenir une boule rouge à un } \\ \text { tirage? } \\ \text { 2. On procède à } 4 \text { tirages successifs avec remise. On note } X \\ \text { le nombre de boules rouges obtenues. Quelle est la pro- } \\ \text { babilité d'obtenir: } \\ \text { (a) exactement } 3 \text { boules rouges? } \\ \text { (b) au plus } 2 \text { boules rouges? } \\ \text { (c) au moins } 3 \text { boules rouges? }\end{array} \).

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Pour calculer les probabilités, il faut connaître la probabilité \( p \) d'obtenir une boule rouge. Ensuite, on utilise la loi binomiale pour déterminer les probabilités d'obtenir exactement 3, au plus 2, ou au moins 3 boules rouges lors de 4 tirages avec remise.

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