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)。
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。
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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