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mock里的两道题。请大家帮我看看。拜托~

 Asset   Weight (%)  Expected Return    Expected Standard Deviation

X                 75                 11%                    5%

Y                 25                 7%                        4%

If the correlation of returns for the two assets equals 0.75, and the risk-free interest rate 1 percent, then the expected standard deviation of the portfolio is closest to:

 

A. 3.07%.
B. 4.23%.
C. 4.55%.

 

答案选的是C。我觉得不对啊。大家能帮我看看吗?

 

An analyst collected the following data for an asset:
Possible Rate of Return (Percent)   Probability
-10%                  0.20
-5                     0.30
10                     0.40
25                     0.10
The variance of returns for the asset are closest to:
A. 121.
B. 188.
C. 213.

 

这道题也是。我看了他的解法和notes上的不一样啊。

我晕。。我不知道我当时是怎么想的。。。怎么按都按不出答案。。。

心态好重要的。谢谢楼上啊~

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