ＴＴ　ＧＷＤ８－３３　一事不明

sen4sun · 发表于 2006-7-22 13:07:00

A teacher gave the same test to three classes: A, B and C. the average scores for the three classes were 65, 80, 77 . the ratio of the numbers of students in each class who took the test was 4 to 6 to 5. what was the average score for the three classes

这题我用 (65x4+80x6+77x5)/ (4+6+5) 得出大约 74.3

为什么答案无调件舍去得75? 而不是四舍五入得74

还是我计算错误头好痛问这种问题真丢脸不好意思

yaoyao99 · 发表于 2006-7-22 13:27:00

Ahaha, shame on you! (260 + 480 + 385)/15 = 75

sen4sun · 发表于 2006-7-22 13:31:00

is it?　damn it. i need a calculator.. i swear i calculated it "MULTIPLE" times..

yaoyao99 · 发表于 2006-7-22 13:33:00

Hee hee, now you're just embarassing yourself, j/k

It's 1125/15, no?

sen4sun · 发表于 2006-7-22 13:34:00

apparently.. 77*5= 375 is to me.. i am either really tired or really retarded.. i suspect the latter... sorry for wasting your time......

sen4sun · 发表于 2006-7-22 13:38:00

其实这个帖是故意让大家修息一下来搞笑的　　

　　　right....!

katie83 · 发表于 2006-7-22 14:09:00

斑竹,严肃点

pumpkin · 发表于 2006-7-22 14:13:00

以下是引用katie83在2006-7-22 14:09:00的发言：

斑竹,严肃点

9494

sen4sun · 发表于 2006-7-22 14:22:00

我是真的验算很多遍一直算错才发上来的..... 觉得很丢脸才说是来搞笑的没有不严肃还有干嘛一直把这帖顶上来很丢脸耶不要误会我啊

[此贴子已经被作者于2006-7-22 14:45:13编辑过]

jandjshi · 发表于 2006-7-22 14:47:00

再顶顶.

I have the same problem. my 3*6 is always 24. I don't know why. I almost got a concussion for hitting myself so hard.

ＴＴ　ＧＷＤ８－３３　一事不明