Center of a data set is a single number that sumarizes the entire data, the median is the best measure of center to use in this distribution.
Median is the midpoint value of a data set, where the values are arranged in ascending or descending order:
As a first step let's organize the data in ascending order:
3, 4, 5, 6, 7, 8, 9, 10, 11
The median is 7.
