8.有一堆东东X, 每一件的正确与否都用两种方式记录: Paper 和Electrical. 在X中60%有PAPER错误的也有ELEC错误,75%有ELEC错误的也有PAPER错误,X中总共有3%既有PAPER错又有ELEC错。问X中既没有PAPER错也没有ELEC 错的比率。
9、 两个集合S和T, S的range is x and T 的range is y, S 包含T,S and T 的元素均不同,问x>Y?
(1)the number of the fators in S is 7
(2)the number of the fators in T is 6
10.saturday morning某人旅行,如果某天遇上下雨,就在当天下午回家,已知
the three days following saturday each has a 下雨的probability 是0.2,问这个人周一下午回家的概率。(1-0.8)*(1-0.8)*0.2 我觉得应该是0.8*0.8*02,应该是写错了吧。
9.RANGE是波动的范围。所以都不行吧。
8你画张图表看。我做得91/100
7都满足吧。你试看就知道。
6.很明显吧。设第一年为X,然后是(1+M/100)*X,然后类推。
5选E吧。不能确定出剩的数啊。
4.都不行。也是不能确定。
3.三场为200.225.250所以选C。
2.都满足吧。
1.我觉得是D。
大家讨论一下吧。
"作者: sunnY_yueliu 时间: 2002-6-18 03:30
I got the different answers as following. Hope the third person can confirm.
1. B
3. B
5. B
8. 94
Thanks!作者: juleyi 时间: 2002-6-20 02:30
1。感觉是D,请问选B解法?
2。C
3。B
4。5。6。7。8。10同意zhouxh
9、 两个集合S和T, S的range is x and T 的range is y, S 包含T,S and T 的元素均不同,问x>Y?
(1)the number of the fators in S is 7
(2)the number of the fators in T is 6
Does "S 包含T" mean: S includes the elements of T ?
____________
Human beings come into the world with certain aspirations; they need to know and they need to create. It is the fulfilment of these aspirations that they call happiness. Happiness is like a talent that has to be cultivated.
------The Seeds of Happiness作者: sunnY_yueliu 时间: 2002-6-20 05:29
1. B
Standard deviation measures the average difference from mean. The more the values in the series fall apart, the larger the SD will be. So assum there are four 6s and five 10s, then SD will around 2.5, which < 3. On the other hand, if all 9 values are 6.1, then the SD will be zero, which also <3. Thus select B.
(use the same method to apply the A, you can only get the SD=0 or SD is around 4.5)
2. Still agree with zhouxh (D)
3. Thanks for the confirmation
5. Agreew with you and zhouxh (E)
8. Still think it should be 94/100
9. Not sure, hope anyone else can clarify
Thanks作者: juleyi 时间: 2002-6-20 09:21
1. Thanks for making it clear.
2. 已知S`4*X`3*Y`7大于0,问SXY是否大于0:
A、Y 小于0:
B、X 大于0。
Does S`4*X`3*Y`7 mean: the 4th power of s multiply the 3rd power of x multiply the 7th power of y ?
then we can get different answers by single A or B when s is a positive or negative number ?
8. 有一堆东东X, 每一件的正确与否都用两种方式记录: Paper 和Electrical. 在X中60%有PAPER错误的也有ELEC错误,75%有ELEC错误的也有PAPER错误,X中总共有3%既有PAPER错又有ELEC错。问X中既没有PAPER错也没有ELEC 错的比率。
let a and b the percentage of with error in paper and electrical, then: a*60%=b*75%=3% ==> a=5% and b=4%, then the percentage of no error is 91%.
____________
------The Seeds of Happiness作者: sunnY_yueliu 时间: 2002-6-21 00:21
2. On second thought, it should be E. (can not be A, B or C since both A and B are saying the same thing)
S^4*X^3*Y^7 > 0 ==> both X and Y >0 or both X and Y <0. Since we can not determine the S, thus don't know the SXY.
8.a=5% and b=4% and c=3% (let c present the product with both E error and P error) So the product without any error =100-4-5+3=94% (since the c has been count twice fro both a and b)作者: juleyi 时间: 2002-6-21 00:44
2. E agree
8. 94%, you are right.
Thanks for discussion in detail !
____________
------The Seeds of Happiness
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