The six sigma black belt should be able to compute the mean and standard deviation from a grouped frequency distribution 6西格玛黑带应能从一组频次分布数据计算出均值和标准偏差。
2.
The six sigma black belt should be able to compute the mean and standard deviation from a grouped frequency distribution 译文:六西格玛黑带应该能够计算出一个分组发生频次分布数据的均值和标准偏差。