单项选择题
A.23.97% B.9.9% C.18.34% D.18.67%
A.相同的标准差和较低的期望报酬率 B.相同的期望报酬率和较高的标准差 C.较低的报酬率和较高的标准差 D.较低的标准差和较高报酬率
A.15% B.13% C.15.88% D.16.43%