问题
单项选择题
Roger Clement, CFA, is a public fund manager at Morgan Capital and does research about z-value. The first step for Clement in the process of standardizing a random variable from a given normal distribution to obtain the zvalue is:（）
A. to subtract the population mean from the observation obtained.
B. to multiple the observation obtained by the reliability factor assumed.
C. to divide the population mean by the standard deviation.
答案
参考答案：A
解析：
根据定义可知，z-值是将观察值减去总体平均值后，再除以标准差。