This is important, because it shows that looking at just the average is not enough, especially if your standard deviation is a large number.

这是很重要的，因为它说明了，仅查看平均值是不够的，特别是当您的标准偏差非常大的时候。

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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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In Figure 11, the overall average response time dropped by slightly more then half, with the standard deviation well under 1 second.

在图11中，整体的平均响应时间下降了一半以上，并且标准偏差低于1秒。

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7% 77% is class average and the standard deviation was 17% so you can see where things lie. 50% is a pass.

7是平均水平，标准偏差是%,这就是事情所在，50%就及格。

麻省理工公开课 - 固态化学导论课程节选

Thus, a reading above 50% for bullish sentiment would be one standard deviation above average and a reading of 41% for bearish sentiment would be one standard deviation above the average.

FORBES: How Much Should You Rely On Sentiment Surveys?

Bullish sentiment is just slightly above one standard deviation from the historical average and bearish sentiment is within one standard deviation.

FORBES: Why Is Bullish Sentiment Near Two And A Half Year High?

Placing asset categories on the efficient frontier requires knowing their historical average return and standard deviation.

FORBES: Asset Allocation and the Efficient Frontier