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Mara y Rosa toman un mismo curso con profesores diferentes y el primer examen de ambas cubra el mismo material y las mismas puntuaciones. En

Mara y Rosa toman un mismo curso con profesores diferentes y el primer examen de ambas cubra el mismo material y las mismas puntuaciones. En la prueba para ambas obtuvieron los siguientes: Mara 70% y Rosa 85%, adems media y desviacin estndar de los grupos a los que pertenecan Mara y Rosa son

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