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Si un gerente de control de calidad quiere estimar, con un 95 % de confianza, la vida media de bombillas, con un margen de ms-menos

Si un gerente de control de calidad quiere estimar, con un 95 % de confianza, la vida media de bombillas, con un margen de ms-menos 20 espacio horas y tambin supone que la desviacin estndar poblacional es de 100 horas, cuntas bombillas necesita seleccionar?

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