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If 75% of the students have got x marks or more, find the value of x.
The ans is A but I don't know how to obtain it...
F.2 Frequency Polygon
2008-06-02 1:24 am
回答 (1)
2008-06-02 8:20 am
✔ 最佳答案
total noumber of students= 40(by counting the frequency of each of the marks then add them up)40 x 75% = 30
Then,
count from the highest mark
7+9+14=30
so, the answer is 45.5marks or more.
收錄日期: 2021-04-13 15:38:19
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080601000051KK02139