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请教：试验检测员考试（公路）模拟试卷4第4大题第5小题如何解答？

【题目描述】

新建高速公路路基施工中，对其中某一路段上路床压实质量进行检查，压实度检测结果分别为98.6、95.4、93.0、99.2、96.2、92.8、95.9、96.8、96.3、95.9、92.6、95.6、99.2、95.8， 94.6、99.5(单位%)。请按保证率95%计算该路段的代表压实度，并进行分析评定。[已知 t_0.95(n-1)/4=0.438，t_0.975(n-1)/4=0.533]

【我提交的答案】：

【参考答案分析】：

计算得：请教：试验检测员考试（公路）模拟试卷4第4大题第5小题如何解答？【题目描述】新建高速公路路基施工中高速公路路基上路床压实度规定值为96%。因：K_代＜96% 所以该段路基压实度不合格。

请问答案中为什么保证率选择的是0.438，而没有选择另外一个

暂无答案

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