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。
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。
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。
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