选择题:各标志值加上(或减去)某一常数后计算的平均数A、与原平均数相等B、等于0C、等于原平均数加上(或减去

题目内容:
各标志值加上(或减去)某一常数后计算的平均数
A、与原平均数相等
B、等于0
C、等于原平均数加上(或减去)该常数
D、与原平均数无关
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