average standard deviation

基本解释

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。
Measurements: Glucose variability was calculated for all subjects as the average and standard deviation of glucose, the mean amplitude of glycemic excursions, and the glycemic lability index.
观察指标：（测定所有患者不同时段血糖），计算血糖平均值及标准差、平均血糖波动幅度、血糖不稳指数三项指标来反应血糖变异性。
The report covers each student's exam mark, usual-time mark, overall mark, as well as the whole class' average, standard deviation, maximum, minimum, range, mark distribution and makeup information.
考试质量分析报告的内容包括每个学生的考试成绩、平时成绩、总评成绩、全班的平均分、标准差、最高分、最低分、全距、以及补考和成绩分布情况。

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