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五箱苹果的质量分别为(单位:千克):18,20,21,22,19.则这五箱苹果质...
五箱苹果的质量分别为(单位:千克):18,20,21,22,19.则这五箱苹果质量的平均数和中位数分别为( )
A.19和20
B.20和19
C.20和20
D.20和21
考点分析:
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