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si la vida media de operacion de una pila de linterna es de 24 hrs y esta distribuida normalmente con una desviacion de 3 horas

si la vida media de operacion de una pila de linterna es de 24 hrs y esta distribuida normalmente con una desviacion de 3 horas cual es la probabilidad de que una muestra aleatoria de 100 pilas tenga una media que se desvie por mas de 30 minutos del promedio

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