一个样本容量为10的样本数据,它们组成一个公差不为0的等差数列{an

一个样本容量为10的样本数据,它们组成一个公差不为0的等差数列{an},若a38,且a1a3a7成等比数列,则此样本的平均数和中位数分别是(  )

A13,12                                                       B13,13 

C12,13                                                       D13,14

答案

B

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