V2EX mean-value

Mean Value

Definition / 释义

mean value平均值、均值。指把一组数值相加后除以数量得到的代表性数值,最常见的是算术平均数(arithmetic mean)。在概率与物理中也常指期望值(expected value)的直观含义(语境不同会略有区别)。

Pronunciation / 发音

/min vlju/

Examples / 例句

The mean value of these scores is 85.
这些分数的平均值是 85。

In experiments, we report the mean value and the standard deviation to show both the center and the spread of the data.
在实验中,我们报告平均值和标准差,以同时展示数据的中心位置和离散程度。

Etymology / 词源

mean 原义与“中间、居中”相关,来自古英语 gemne(共同的、普通的)等词源发展而来,在数学语境中引申为“居中的代表值”。value 来自拉丁语 valēre(有价值、强健、有效),经法语进入英语,表示“价值、数值”。合起来 mean value 就是“代表性的(居中)数值”,即“平均值/均值”。

Related Words / 相关词

Literary Works / 文学作品

  • An Introduction to Probability Theory and Its Applications(William Feller)
  • Statistical Inference(George Casella & Roger L. Berger)
  • The Feynman Lectures on Physics(Richard P. Feynman 等)
  • Probability and Measure(Patrick Billingsley)
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