离差 (Chinese Wikipedia)

Analysis of information sources in references of the Wikipedia article "离差" in Chinese language version.

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虞昊. 第2章概率統計基礎知識. 现代防雷技术基础. 清华大学出版社. 2005: 28. 隨機變量對 ${\bar {x}}$ 的離差（又稱距平）