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3. En cierta regin los salarios diarios de los mineros del carbn estn distribuidos normalmente con una media de $864.500 y una desviacin estndar

3. En cierta regin los salarios diarios de los mineros del carbn estn distribuidos normalmente con una media de $864.500 y una desviacin estndar de $15000. &Cul es la probabilidad de que una muestra representativa de 25 mineros, tenga un promedio diario de inferior a $857.500?

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