What the standard deviation really tells you is that some set of users were + or - the test average (or arithmetic mean).

标准偏差真正能够告诉您的是，某些用户是高于还是低于平均测试水平(或者算术含义)。

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Cannily, the Corning researchers simply took the arithmetic mean of the oxide compositions and created a winning combination, known as "1737 glass", with exactly the right density.

康宁公司精明的研究人员们仅采用了算术平均法来处理氧化物，便成功地制造出一种称为“1737玻璃”的合成物，该玻璃的密度正好符合要求。

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It is not a simple arithmetic mean.

它并不是简单的算术平均。

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In fact, there are some very old books that show this as the average, the sum divided by two arithmetic mean, but the modern practice is to use the geometric mean.

事实上，一些很老的书籍上,平均的定义就是算数意义的，总的来说被分为两种算数意义，但现代我们多用几何意义。

麻省理工公开课 - 固态化学导论课程节选

To do so is to be guilty of using a simple arithmetic calculation that leans on mean reversal theory.

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