问题 问答题

某公司打算用部分闲置资金对外投资,可供选择的甲、乙两公司的股票及其概率分布情况如下所示:

状 况 繁荣 一般 衰退
概率 0.4 0.4 0.2
甲公司报酬率 60% 40% 0
乙公司报酬率 50% 40% 20%
要求:根据风险与收益的关系,请作出合理的选择。

答案

参考答案:(1)甲、乙公司的期望报酬率分别为:
甲公司:
60%×0.4+40%×0.4+0×0.2=40%
乙公司:
50%×0.4+40%×0.4+20%×0.2=40%
(2)甲、乙公司的标准离差分别为:
甲公司:
[*]=21.91%
乙公司:
[*]=10.95%
因为甲乙两个公司的期望报酬率相同,乙公司的标准离差小于甲公司,所以应该选择乙公司。

阅读理解

阅读理解。

     What kind of TV programs are people watching in the USA? Which are their favorites? I'm sure you will be

interested in the answers.

     TV series

     Soap opera and sitcom are two main kinds. Soap opera is a series. Each part of a soap opera is

interconnected. A sitcom is a line of humorous stories. It makes people laugh. These stories all happen in a

small place, such as a home or a workplace. Growing Pain in the USA and Home With Kids in China are both

good sitcoms.

     Reality shows and talk shows and game shows

     America Idol is a popular reality show. It is something like Super Girl in China. Recently, the famous game

show in America is Are You Smarter than a 5th Grader. Talk show is that a group of people come together to

talk about some topics with a host. Larry King is the most famous talk show host in America.

     Sports programs

     The following two are very popular:

     NBA(the National Basketball Association 英国职业篮球联赛)

      NFL(the National Football League 全美职业橄榄球联赛)

     Cartoons

     The Simpson's is a well-known cartoon in America and around the world.

1. Where do humorous stories happen?

______________________________________________________________________

2. What is the famous gable show in America?

______________________________________________________________________

3. Who is the most famous talk show host?

______________________________________________________________________

4. What are the very popular sports programs?

______________________________________________________________________

5. What is the well-known cartoon in America and the world?

_____________________________________________________________________

单项选择题