The median of a dataset is the middle value when the values are sorted.

For example, the median of [5,1,7,3,10] is 5 as when sorted the list is [1,3,5,7,10].

If a dataset has an even number of values, the median is the average of the middle two. For example, the median of [2,3,4,10] is 23+4​=3.5.

Mathematically, the median is the

value. Notice that if n is even then 2n+1​ is halfway between two consecutive integers, indicating we need to average their values.