the standard score of Linda in a maths test is 1.0. Given that the
marks obtained by the students in this test are normally distributed,find
the percentage of students whose marks are lower than Linda.
ans: 84%
pls show clear steps!
F.5 dispersion
2011-03-08 3:07 am
回答 (1)
2011-03-08 3:50 am
✔ 最佳答案
圖片參考：http://upload.wikimedia.org/wikipedia/commons/thumb/8/8c/Standard_deviation_diagram.svg/350px-Standard_deviation_diagram.svg.png
Let σ be the Standard Deviation :
L be the mark of Linda
X be the mean marks of students
Standard score = 1 ,
i.e.
(L - X) / σ = 1
L = X + σ
The required % = 50% + 34% = 84%
收錄日期: 2021-04-21 22:20:23
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110307000051KK00916