问题如下图：
选项：
A. 
B. 
C. 
请问U是没有单位的吗？这题算对了但是E（r）的单位是%，后面standard deviation平方的单位是%^2，两个加在一起的单位是？
解释：
NO.PZ2015121801000055 问题如下 A financiplanner hcreatethe following ta to illustrate the application of utility theory to portfolio selection:If investor’s utility function is expresse U=E(r)− 1 2 A σ 2 anthe measure for risk aversion ha value of -2, the risk-seeking investor is most likely to choose: A.Investment 2. B.Investment 3. C.Investment 4. is correct.Investment 4 provis the highest utility value (0.2700) for a risk-seeking investor, who ha measure of risk aversion equto −2.
Investment 3. Investment 4. C is correct. Investment 4 provis the highest utility value (0.2700) for a risk-seeking investor, who ha measure of risk aversion equto −2. 这道题第四个，应该是18+0.09，而不是27+…吧？
第四个组合U=18+0.5*2*0.3^2=18.09 第三个组合U=20+0.5*2*0.15^2=20.0225 选第三个组合才对吧？
4 hthe biggest stanrviation & biggest uyility,所以选4？ 如果4 hthe biggest stanrviation & samaller uyility,那选谁？ 除了risk neutral选择最大的return之外，risk seeker 和risk averse都选择最大的utility?
risk-seeking investor和risk averse investor 都要选择utility最大的组合吗?
