the month salearies are given below, in units of $1000s
7 79 19.3 18 17 34 29 13
assuming that this small dataset also represented salaries for hk as a whole,could you use this graph to estimate the % of hk people that earn more than $32000 per month?What do yoou estimate?
數學(有關STAT)
2011-02-17 2:57 pm
回答 (1)
2011-02-17 5:48 pm
✔ 最佳答案
Let X = the month salearies, in units of $1000s X~N(μ,σ²)
μ=27.0375
σ² {n-1} = 22.6567²
X~N(27.0375,22.6567²/8)
P(X>32) = P(Z>(32-27.0375)/(22.6567/√8))
=P(Z>0.6195)
=0.2322
23.22% of hk people earn more than $32000 per month
(Assume the true variance follow this graph)
唔知可唔可以咁做架呢
收錄日期: 2021-04-13 17:50:46
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110217000051KK00152