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325-1. Una empresa elctrica fabrica focos que tienen una duracin que se distribuve de forma aproximadamente Con media de 800 y una desviacin estndar

325-1. Una empresa elctrica fabrica focos que tienen una duracin que se distribuve de forma aproximadamente Con media de 800 y una desviacin estndar de la de 800 horas contra Ia alternatva 800 horas si una mue5tra aleatoria de 30 foc05 tiene una duracln promedio de 788 horas. Utilice un nivel significante de 0.04.

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