质量控制图是保障生产过程处于统计控制状态，减少废品出现的有效工具。
Quality control chart is a useful tool for monitoring produce process in statistics state and reducing waster.
给出一组分组数据，六西格玛黑带应能选择和作出正确的控制图，并且确定给定的过程是否处在统计控制状态。
Given a set of subgrouped data, the Six Sigma Black Belt should be able to select and prepare the correct control charts and to determine if a given process is in a state of statistical control.
基于系统的状态划分，以统计理论的观点分析了容错控制系统中的故障概率、容错能力和可靠性问题。
The fault probability, the degree of fault tolerance and problem of reliabilty in the fault tolerant control system are analyzed in the view of statistics.
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