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Une enquete sur le nombre d'appels recus par un echantillon d'abonnes de la societe Telephonia la semaine derniere a revele les renseignements suivants : 52,

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Une enquete sur le nombre d'appels recus par un echantillon d'abonnes de la societe Telephonia la semaine derniere a revele les renseignements suivants : 52, 43, 30, 38, 30, 42, 12, 47, 39, 37, 34, 46, 32, 18, 41, 16 Calculer l'ecart-type du nombre d'appels dans cet echantillon

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