题目

  Neither is that _______ .   A. your nor is that mine       B. yours nor is that me   C. yours nor that is mine      D. yours nor is that mine 答案:D某学员在一次射击测试中射靶10次,命中环数如下:7,8,7,9,5,4,9,10,7,4,  则命中环数的方差为          .  (注:方差,其中为的平均数)
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