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6. (4 puntos) Una empresa fabrica focos que tienen una duracion distribuida aproximadamente en forma normal. Si una muestra de 25 focos tiene una vida

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6. (4 puntos) Una empresa fabrica focos que tienen una duracion distribuida aproximadamente en forma normal. Si una muestra de 25 focos tiene una vida promedio de 780 horas, con una desviacion de 40 horas, obtenga un intervalo de confianza de 90% para la media de la poblacion de todos los focos producidos por esa empresa

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