The following information relates to the distribution of monthly returns from a diversified investment portfolio:
The distribution of monthly returns is best described as:()
A. positively skewed with a long tail on the left side.
B. negatively skewed with a long tail on the left side.
C. positively skewed with a tong tail on the right side.
参考答案：B
解析：
Skewness affects the location of the mean, median, and mode of a distribution as summarized in the following bulleted list. For a positively skewed distribution, the mode is less than the median, which is less than the mean. The mean is affected by outliers; in a positively skewed distribution, there are large, positive outliers which will tend to "pull" the mean upward, or more positive. For a negatively skewed distribution, the mean is less than the median, which is less than the mode. In this case, there are large, negative outliers which tend to "pull" the mean downward (to the left).