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5.- En una distribucin normal con media de 870 y desviacin estndar de 74, qu tan grande se debe tomar una muestra para que la

5.- En una distribucin normal con media de 870 y desviacin estndar de 74, qu tan grande se debe tomar una muestra para que la probabilidad sea al menos de 0.95 de que la media de la muestra caiga entre 870 y 780?

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