单选题 An analyst obtains the following annual returns for a group of stocks: 10%, 8% ,7% ,9% , 10%, 12%,11%,10%,30%, and 13%. This:

A. distribution has a median greater than its mode.
B. distribution's arithmetic mean is 12 and the median is 10.5.
C. distribution is skewed to the right and the mean is greater than the mode.

【正确答案】 C

【答案解析】Mean = 120/10=12, median =10, and mode =10. The distribution is skewed to the right, so the mean is greater than the median and mode. Generally, for positively skewed distributions, the mode is less than the median, which is less than the mean. In this case, the mode and median are equal because the number of observations is small.