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Exercice 4.14 Dans la manufacture de plaquettes de comprims d'un mdicament, 5% des pla- quettes sont dfectueuses. On choisit n plaquettes au hasard pour

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Exercice 4.14 Dans la manufacture de plaquettes de comprims d'un mdicament, 5% des pla- quettes sont dfectueuses. On choisit n plaquettes au hasard pour le contrle de la qualit. (a) Supposez que n 25 plaquettes sont vrifies. Quelle est la probabilit qu'au moins une plaquette soit dfectueuse? (b) Parmi n 25 plaquettes, quelle est le nombre espr de plaquettes dfectueuses? (c) Combien de plaquettes doivent tre slectionnes afin d'tre certain 90 % d'avoir au moins une plaquette dfectueuse parmi les n plaquettes slectionnes?

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