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【单选题】
对数据集的预处理中,常用的数据变换方法有0-1标准化和z-score标准化。使用z-score标准化时 ,若收据集中年收入属性的均值为65,标准差为12,则年收入59万元标准化后为( )。
A.
-0.2
B.
0.5
C.
0.3
D.
-0.5
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The athletes using the drugs will be caught by the proper authorities and ejected from the race.
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