问题
单项选择题
An analyst gathered the following information about the monthly returns over the same time period from two diversified investment portfolios:
| portfolio X | portfolio Y | |
| Mean | 1.2% | 1.2% |
| Median | 1.1% | 1.3% |
| Mode | 1.0% | 1.4% |
②B. No Yes
③C. Yes No
（）
A．①
B．②
C．③
答案
参考答案：A
解析：
Portfolio X is positively skewed and Portfolio Y is negatively skewed.