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dsProject/dsRag/Txt/MATH_1_29.txt

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3 weeks ago
： 平均数的意义是什么？
样本平均数不仅是一个算式 / 误差模型 / 误差的随机性：正负抵消和为零 /
样本平均
数是随机的 / 样本平均数是无偏估计