Maths problem:我已計了多次,也計不到老師的答案：S.D=16.7,可否協助計算, thanks?
回答 (1)
2020-09-08 12:26 pm
✔ 最佳答案
資料: -7,5,-20,-13,31,24,1,-9n = 8
mean = (-7+5-20-13+31+24+1-9)/8 = 1.5
ΣXi^2 = (49+25+400+169+961+576+1+81)
= 2262
σ^2 = 2262/8 - 1.5^2 = 282.75-2.25=280.5
σ = √280.5 = 16.748 ≒ 16.7
收錄日期: 2021-04-24 08:04:08
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20200908020429AArNhnF