题目内容

若已知甲公司股票报酬率的平均值与变异系数分别为10%与4%,而乙公司股票报酬率的平均值与变异系数分别为15%与2%;甲、乙公司股票报酬率的共变异系数为-1%。如果投资组合的70%持有甲公司股票,30%持有乙公司股票,则平均投资报酬率为()。

A. 6.25%
B. 9.50%
C. 11.08%
D. 11.50%

查看答案
更多问题

如果上述情况确实存在,并且吸烟确实增加生畸形儿的危险,那么,研究结果的相对危险度与真实的相对危险度相比是

A. 相同
B. 高估了
C. 低估了
D. 颠倒了
E. 不能确定

[A] cured [B]changed [C]improved[D] saved

___________the weather was fine,I opened all the windows. [A]For[B]Becauseof[C]Nowthat[D]Sincethat

What can we learn from thepassage?[A]Peoplekeep dogs mostly for companionship now. [B]Mostpeople in the West still keep dogs for protection. [C]Peoplekeep dogs because they love animals.

答案查题题库