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La dimensin en milmetros se emplea para medir el resultado de un proceso de produccin. Cuando el proceso est bajo control, la media de ste

La dimensin en milmetros se emplea para medir el resultado de un proceso de produccin. Cuando el proceso est bajo control, la media de ste es = 128.5 y la desviacin estndar es = 0.4.

a) Elabora una grfica x para el proceso si el tamao de las muestras que se utilizarn es de 6.

b) Para una muestra de la que se obtienen los datos que se muestran a continuacin, el proceso est bajo control o fuera de control? Argumenta tu respuesta.

| 128.8 | 128.2 | 129.1 | 128.4 | 128.4 | 129.2 |

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