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3. Si la desviaci6n estndar de los tiempos de vida de los tubos de televisi6n se estima en 100 horas Lqu tan grande debe
3. Si la desviaci6n estndar de los tiempos de vida de los tubos de televisi6n se estima en 100 horas Lqu tan grande debe ser la muestra que se tome para que se obtenga confianza (a) 95%; (b) 90%; (c) 99% (d) 99.73%; de que el error en el tiempo estimado de vida media no exceda las 20 horas?
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