The Six Sigma Black Belt should be able to compute the mean and standard deviation from a grouped frequency distribution.

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。

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For example, Web-access statistics (as currently compiled) are little more than frequency counts grouped in various ways.

例如，Web访问统计信息(按当前所编辑的)只不过是以各种方式进行分组的频率计数。

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Then the lymph nodes were grouped in detail and the metastatic frequency of each group was compared.

分析各组淋巴结的转移频率和相互关系。

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Then the lymph nodes were grouped in detail and the metastatic frequency of each group was compared.

分析各组淋巴结的转移频率和相互关系。

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