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______.
答
=. x
=165.5163+164×2+165+166+167×2+168 8
=
s
2
=2.75
(163−165.5)2+(164−165.5)2+…+(168−165.5)2
8
答案:2.75