15. In 2019, the mean is bigger than the median. Additionally, the distribution is unimodal. From these facts, we can conclude that the distribution is which of the following? (Explanation: To see that the distribution is unimodal, refer to the original table. Imagine calculating the heights of the rectangles you would graph over the first and fourth class intervals, and adding these to the heights you calculated in questions 9 and 10.) a. symmetric b. positively skewed C. negatively skewed