单选题:关于对称分布资料,理论算术均数和中位数大小是(  )。

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题目内容:
关于对称分布资料,理论算术均数和中位数大小是(  )。 A.相等
B.不能确定谁大谁小
C.算术均数大于中位数
D.算术均数小于中位数
E.两者之间无可比性
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