average or arithmetic mean
平均或算术平均数
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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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The more common method of calculating averages is known as the arithmetic mean, or simple average.
更常见的计算方法被成为算数平均法，或者简单平均数。
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