The problem is asking for the median and the mean of the data set.
Remember that the median is defined as the middle number in the set (after the numbers have been arranged from least to greatest)
On the other hand, the mean is the addition of the element in the data set divided by the number of elements.
Regarding the median
We first need to order the data in this way:
As we can see, there are 9 elements, so the median is the central number (the 5th number).
So, we can see that:
As for the mean:
Finally, as the mean is equal to 2 and the median is equal to 1.5, we get that
Therefore, the answer to the question is option D