The following table summarizes the results of a poll taken of CEOs and analysts about the economic impact of a pending piece of legislation:
|
Group
|
Think the legislation will have a positive impact.
|
Think the legislation will have a negative impact.
|
Total
|
|
Others
|
40
|
30
|
70
|
|
Analysts
|
100
|
30
|
130
|
|
Total
|
140
|
60
|
200
|
What is the probability that a randomly selected individual from this group will be either an analyst or someone who thinks this legislation will have a positive impact on the economy?
A. 0.35.
B. 0.58.
C. 0.64.
None of the above
[此贴子已经被venson于2005-11-26 22:49:31编辑过]
统计还没有开始看呢。不过我觉得是“NONE OFTHE ABOVE” ，错了，别打噢。
我的算法； (40/200)*(70/200)+(100/200)*(130/200) = 0.395 大家切磋一下。本人离开学校有一段时间了。
正确答案是什么啊？
我的算法； (40/200)*(70/200)+(100/200)*(130/200) = 0.395 大家切磋一下。本人离开学校有一段时间了。
just try
P(A or B) = P(A)+P(B)-P(A and B)=0.85
so m010915's answer seems to be incorrect.
I prefer the last answer "none of the above".
[此贴子已经被作者于2006-7-4 2:36:55编辑过]
just try
P(A or B) = P(A)+P(B)-P(A and B)=0.85
so m010915's answer seems to be incorrect.
I prefer the last answer "none of the above".
版主，咱们论坛有没有开设CFA的QQ群呢？
谢谢
[em01]answer A
P(analysts)=130/200=13/20
P(Positive impact)=140/200=14/20
P(analyst and Positive impact)=100/200=10/20
P (Answer) = 13/20+14/20-12/20=7/20=0.35
今天第一次登陆来看看传说中的CFA证书网站,同时看看大家的一些讨论.结果大失所望.就拿这道题目来说吧,这么简单的一个概率论的题目,结果所有的人的答案都不对的.(虽然有人误打误撞选了D,但是数值结果明显错误.).
所以说,什么CPA,CFA等等证书,其实一点也不难.我以前中学的同班同学很早就获得了CPA,还有一个CFA,然后他们跟我说怎么难考.我就纳闷,他们当年在学校里都是二流脚色,绝对算不上超一流的水平,这么难考,也能考过.结果上网一看,笑死人了.
说到这里,肯定有人要拍砖了.是的,我没有CFA证书,但是并不表示我觉得难考.我相信很多以前中学理工科很好,逻辑思维很清楚的人考这个应该没有问题吧.
还是那句话,中国一流的中学人才真的是去了理工科或国外.
| 欢迎光临 CFA论坛 (http://forum.theanalystspace.com/) | Powered by Discuz! 7.2 |