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Se examin una muestra de ocho compaas en la industria aeroespacial con relacin a sus rendimientos sobre la inversin el ao pasado. Los resultados son

Se examin una muestra de ocho compaas en la industria aeroespacial con relacin a sus rendimientos sobre la inversin el ao pasado. Los resultados son (en porcentajes): 10.6, 12.6, 14.8, 18.2, 12.0, 14.8, 12.2 y 15.6. Calcular: a) media, b) mediana, c) moda, d) varianza usando la frmula de la desviacin, e) varianza usando la frmula directa f) desviacin estndar muestral.

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