已知一组数据163,164,164,165,166,167,167,168,求这组数据的方差_.

问题描述:

已知一组数据163,164,164,165,166,167,167,168,求这组数据的方差______.

.
x
163+164×2+165+166+167×2+168
8
=165.5
s
(163−165.5)2+(164−165.5)2+…+(168−165.5)2
8
=2.75

答案:2.75