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别被平均值骗了!这个Excel函数用错了比不用还糟

  • 2026-08-09 21:38:24
别被平均值骗了!这个Excel函数用错了比不用还糟

上个月,销售部的小周被老板叫去办公室。

老板指着报表问:“团队平均业绩8万,为什么一半人连5万都不到?”小周支支吾吾答不上来。
后来他跑来找我诉苦:“平均业绩确实是8万啊,我算了好几遍,没错啊。”
我说:“你算的没错,但你用的方法有问题。你被平均值骗了。”
AVERAGE这个函数,人人都觉得简单。但正是因为它太简单,反而最容易被用错。
今天就来聊聊AVERAGE,以及比它更靠谱的几种算法。

 AVERAGE的正确用法

先简单过一下基础。
AVERAGE只做一件事:所有数字加起来,除以数字的个数。
写法也简单:
=AVERAGE(A1:A100)
这就完了。但问题也出在这——“所有数字加起来除以个数”这件事,在某些情况下会给你一个误导人的结果。

 什么时候平均值会骗人?

情况一:团队里有“大神”

销售部10个人,9个人月薪5000,1个人月薪50000。用AVERAGE算出来平均月薪9500。
但这个数字能代表这个团队的真实收入水平吗?不能。9个人的收入都低于这个数,这个“平均值”是假的。老板看这个数会觉得“你们工资不低啊”,但大部分人其实拿得不多。

情况二:数据里有“异常值”

你要算一个活动的平均转化率。大部分数据在2%-5%之间,但有一笔数据因为系统错误显示成了500%。AVERAGE会把500%也加进去,结果平均转化率变成了十几。明明正常,算出来偏高。

情况三:分组不对

两个班级的平均分都是80分。A班30人,B班10人。两个“80分”含义完全不同。A班的80分来自30个人,B班的80分只来自10个人。如果你要算“全校平均分”,不能把80和80再平均,要用加权平均。

 这几种算法,比AVERAGE更靠谱

方法一:用MEDIAN算中位数

中位数就是“排在中间的那个数”。把所有人的业绩从低到高排,中间那个就是中位数。
=MEDIAN(A1:A100)
它不会被极端值影响。10个人里1个人月薪5万,9个人5000,中位数还是5000。这个数字更接近大多数人的真实情况。

方法二:用TRIMMEAN去掉极端值

如果你觉得有些数据“不正常”,但又不想完全扔掉,用TRIMMEAN。
=TRIMMEAN(A1:A100, 0.1)
第二个参数0.1的意思是:去掉最大和最小各5%的数据,然后算平均值。去掉两头极端的值,剩下的才是“正常范围”里的平均。

方法三:加权平均

如果你有两组数据,每组样本量不一样,不能直接把两个平均值再平均。
公式相对复杂,但思路就是:用每组人数占总人数的比例去乘以它们的平均分,再加总。

后来我跟小周说,老板问的那个问题,正确回答应该是:“人均8万,但大部分人在5万以下。有一个销冠拉高了整体数字。”

他听完说:“原来问题不在计算,在理解。”
回到标题那句话:AVERAGE用错了比不用还糟,不是函数错了,是你看待数据的方式错了。
平均值只是一个数字,但它背后代表的故事,你得自己读出来。
你平时用平均值的时候,有没有觉得哪里不对劲?评论区聊聊。

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  1. CONNECT:[ UseTime:0.001227s ] mysql:host=127.0.0.1;port=3306;dbname=h_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001612s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000769s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000674s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001291s ]
  6. SELECT * FROM `set` [ RunTime:0.000493s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001545s ]
  8. SELECT * FROM `article` WHERE `id` = 546558 LIMIT 1 [ RunTime:0.004730s ]
  9. UPDATE `article` SET `lasttime` = 1786416895 WHERE `id` = 546558 [ RunTime:0.006248s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000699s ]
  11. SELECT * FROM `article` WHERE `id` < 546558 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001253s ]
  12. SELECT * FROM `article` WHERE `id` > 546558 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001317s ]
  13. SELECT * FROM `article` WHERE `id` < 546558 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003469s ]
  14. SELECT * FROM `article` WHERE `id` < 546558 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.011841s ]
  15. SELECT * FROM `article` WHERE `id` < 546558 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.016463s ]
0.221643s