Concept:The median is the middle value that splits an ordered set of scores into two equal halves.
Explanation:First, arrange the scores in ascending order or descending order.
In an odd-numbered set, there is exactly one score that occupies the central position after sorting.
That central score is the median.
For example, in the ordered set
4,8,12,16,20, the median is
12 because two scores lie below it and two lie above it.
The median is not the highest value, not the arithmetic mean, and not the most frequent score.
It is purely the middle value by position.
Answer:A. Middle value in the set