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S= ∑ (1795,8)2 = 3224,89/122-1 = 3224,89/121=26,65 Desviación estándar de la muestra es la raíz cuadrada: =√26,65 = 5,16 S=5,16 El coeficiente de variación es la razón de la desviación estándar a la media aritmética, expresada como porcentaje: