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单选题 PMP
2008-10-24

A process characteristic has a true (population) mean of 150 and a true (population) standard deviation of 20．A sample of 25 items is taken from this process．The standard deviation of the sample is:（　）
A．0.2
B．0.8
C．4.0
D．5.0

A．0.2
B．0.8
C．4.0
D．5.0
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参考答案

C

答案解析

暂无解析

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