Answer:
13.
Step-by-step explanation:
In this representation, the middle refers to the median, which is calculated by separating elements in equal parts and see which data results in the middle.
From the graph you can observe that number 13 has 6 elements on its right side and 5 elements on its left side, which is the most proximity to the middle of the group of data.
Therefore, the answer is 13, it's in the center.
