You can't think out a number to describe the twenty-five standard deviation event; it's just too large a number for any of us to comprehend.
你无法想出一个数字来描述25个标准差事件；这个数字太大了，我们任何人都无法理解。
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。
How does the standard deviation quantify measurement scatter?
标准偏差如何量化度量值漂移？
From the measurements, compute the mean and standard deviation.
根据度量值计算出平均值和标准偏差。
The good news is the standard deviation, the red line, is trending downward.
好消息是，用红线表示的标准偏差呈现下降趋势。
Overall response time was 1.4 seconds with a standard deviation under 2 seconds.
整体响应时间是1.4秒，并且标准偏差小于2秒。
A point estimate for the standard deviation of the execution time is 645.586 microseconds.
执行时间的标准偏差估值点是645.586微秒。
So how do these outliers and dispersion affect the values of the mean and standard deviation?
那么这些异常值和分散度是怎么影响度量值和标准偏差的呢？
The mean adherence rate in the study population was 96.3% (standard deviation, SD: 7.7).
研究人群中的平均依从率为96.3％（标准差,SD：7.7）。
In fact, the warning at the end says that the standard deviation was not accurately measured.
实际上，末尾的警告指出标准偏差度量不精确。
So, how can the mean and standard deviation be used to determine which of two tasks is faster?
那么，如何用平均值和标准偏差判断两个任务中哪一个更快呢？
Not only have the averages decreased, but the standard deviation has decreased to below 1 second.
不仅减少了平均值，还将标准偏差减少到了1秒钟以下。
The most common statistic for describing measurement spread (or scatter) is the standard deviation.
描述度量值跨度(或者说漂移)的最常用统计技术是标准偏差(standard deviation)。
Thus, if outliers are present within the dataset the mean and standard deviation are located accordingly.
因此，如果在数据集内存在异常值的话，那么度量值和标准偏差会得到相应的定位。
But if I would confine myself just to stocks and bonds, then I would get a much higher standard deviation.
但若组合里只有股票和债券，我的标准差会高得多。
There is an enormous average difference between women and men in this dimension, about one standard deviation.
在有一定偏差的前提下，两性有巨大差异。
See the Standard deviation measurement issues section in the article supplement, which explores this issue.
补充资料的Standard deviationmeasurementissues一节解释了这个问题。
Actually calculating standard deviation can be a little challenging, but luckily many performance tools can help.
事实上，计算标准偏差可能有点麻烦，但幸运的是，许多性能工具可以帮助您完成这个任务。
It is the bell curve to which investors are referring when they talk about a "nine standard deviation event".
当投资者们谈及所谓“九个标准差事件”时，他们实际上在说钟形曲线。
Comparing the ratio of standard deviation to the average for these two distributions shows that they are similar.
把这一标准差和两次的平均值相比较，我们就能发现他们很相像，（因为我们知道重力加速度是个常数）。
Standard deviation inaccurate: See the Standard deviation warnings section in the article supplement for details.
标准偏差不精确：更多信息参见补充资料的Standard deviationwarnings一节。
You can use it to turn your variance measurement into a standard deviation measurement, as shown in Listing 8.
您可以利用此函数将您的样本方差计算转换为样本标准差计算，如清单8所示。
For example, reports that include the average response time now also provide a standard deviation from that time.
例如，报告中包含平均响应时间，并提供了时间的标准偏移量。
Actually, a colleague and I recently discussed the importance of standard deviation and how it is often simply ignored.
事实上，最近我和一个同事讨论了关于标准偏差的重要性，以及它常常被人忽视的情况。
Normally distributed data assumes that about 68% of the values in the sample are within 1 standard deviation of the mean.
正态分布数据认为，样本中约68%的数值分布在距离平均值为1的标准偏差之内。
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)。
Using the average and the standard deviation, you can interpret that 68% of the attempts were between .2 and 1.3 seconds.
使用平均值和标准偏差，您可以说明，68%的尝试是在 0.2秒到 1.3 秒之间。
Since this overhead is static, comparisons are valid and the typical USES of standard deviation in performance testing apply.
因为该负荷是静态的，所以比较是有效的，而且性能测试应用中标准偏差的典型使用也是有效的。
Unfortunately, the measurement scatter is much higher; for example, the standard deviation could easily be three times larger.
不幸的是，度量漂移量很大；例如，标准差很容易增加到三倍。
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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