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请教：试验检测员考试（公路）模拟试卷4第1大题第25小题如何解答？

【题目描述】

一组混凝土试块的强度数据分别为48.0MPa、40.2MPa、52.4MPa，则该组试块强度值应为( )MPa。A．46.7

B．48.0

C．46.9

D．46.8

【我提交的答案】：

【参考答案与解析】：

正确答案：B

答案分析：

解析：试验结果的数据处理：无论是抗压强度还是抗折强度，试验结果均以3个试件的算术平均值作为测定值。如任一个测定值与中值的差超过中值的15%，取中值为测定结果；如两个测定值与中值的差都超过15%时，该组试验结果作废。

怎么算的啊？怎么我做的跟你的答案不一样呢？

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