问题
单项选择题
There is a group of stocks containing 7, 8, 9, 10, 10, 10, 11, 12, 13 and 30. Which of the following statement about the distribution is TRUE（）
A. In this distribution the median is 12.
B. This distribution’s arithmetic mean is 10 and the median is 11.
C. The distribution is skewed to the right and the mean is greater than the mode.
答案
参考答案：C
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.