设 x1，x2，x3，x4 为来自总体X的样本，[img src="https://img.haodaxue.net/uploadimg/image/20200609/20200609170138_39209.png" alt="" />＝（）
A.[img src="https://img.haodaxue.net/uploadimg/ico/2020/0609/1591693355831589.png" />
B.[img src="https://img.haodaxue.net/uploadimg/ico/2020/0609/1591693362769550.png" />
C.[img src="https://img.haodaxue.net/uploadimg/ico/2020/0609/1591693368753720.png" />
D.[img src="https://img.haodaxue.net/uploadimg/ico/2020/0609/1591693373111696.png" />
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正确答案： D 答案分析：无
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