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9. En el ejemplar de noviembre de 1990 de Chemical Engineering Progress, un estudio analiza el Porcentaje de pureza del oxgeno de cierto Proveedor

9. En el ejemplar de noviembre de 1990 de Chemical Engineering Progress, un estudio analiza el Porcentaje de pureza del oxgeno de cierto Proveedor Suponga que la media fue de 99.61, con una des viacin estndar de 0.08. Suponga que la distribucin del porcentaje de pureza fue aproximadamente normal Qu porcentaje de los valores de pureza esperara que estu- viera entre 99.5 y 99.7?

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