NO.PZ2024120401000050
问题如下：
Suppose that we have the following data on three features for each of three banks, A, B, and C:
Scale the features using standardization. What is the standardized number of customers of Bank A ?
选项：
A.-0.690
B.-0.456
C.-0.666
D.-0.498
解释：
As an example, undertaking the standardization for bank A and the customers feature, the calculation would be:
(1.2 - mean(1.2,6,0.5)) / std(1.2,6,0.5) = -0.456.
公式会用，不用算这个题的样本的标准差。
