NO.PZ2018062001000005
问题如下：
When determining the relative degree of variability of different data sets if those data sets have different means or different units of measurement, which of the following parameters is most suitable parameter?
选项：
A.Coefficient of variation.
B.Standard deviation.
C.Mean.
解释：
The relative measurement of risk is the coefficient of variation, which is more useful for measuring data sets with different mean and data sets with different unit of measurement than standard deviation or mean.
The relative measurement of risk is the coefficient of variation, which is more useful for measuring data sets with different mean and data sets with different unit of measurement than standard deviation or mean.
可以从头到尾翻译一下吗？
相对测量风险的工具是coefficient of variation，哪个测量有不同均值的数字组合和不同单位的数字组合的测量工具比标准差和均值更有用？？？
读不懂
