<prompt> Study done on a group of patients showed coefficient of variance for BP and serum creatinine to be 20 15 respectively. Inference is that:Variation in BP is more than in serum creatinine.Variation in serum creatinine is more than in BPStandard deviation of BP is more than of creatinineStandard deviation of creatinine is more than of BP.  <response>: Ans. is a i.e. Variation in BP is more than in serum creatinine. Coefficient of Variance CV is a tool tocompare variability of two different characteristics eg. BP, serum creatinine, height weight etc. in the same group of subjects orcompare variability of the same character in two or more different groups.Thus it is a measure used to compare relative variability.For example, coefficient of variance measureswhether weight varies more than height in a group of studentwhether weight varies more in girls of boys.Thus in the above question - variability is more in BP than in serum creatinine value. Since coefficient of variance is a ratio, it has no units of measurement 