题目内容
（请给出正确答案）
【题目描述】
某路段压实度检测结果为：平均值1.jpg)
=96.3%，标准偏差S=2.2%，则压实度代表值K=( )(%)。(注：Zα=1.645，2.jpg)
=0.518)A．92.7
B．99.9
C．95.2
D．97.4
| 【我提交的答案】： |
| 【参考答案与解析】： 正确答案：C |
解析：压实度代表值K(算术平均值的下置信界限)为：
3.jpg)
式中：4.jpg)
——检验评定段内各测点压实度的平均值；
tα——分布表中随测点数和保证率(或置信度α)而变的系数：高速、一级公路：基层、底基层为99%，路基、路面面层为95%；其他公路：基层、底基层为95%，路基、路面面层为90%；S为检测值的均方差；耀为检测点数。故选C项。
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