The median is generally, a better measure in
valuation analysis as it is the CENTRAL value in a data group. The
central value is found as follows:
MD = (n+1)/2
Summerton and Williamville have 19 sales each:
MD = (19+1)/2 = 10
Therefore, the median sale is that sale at the 10th place.
In Libre Office Calc (a free spreadsheet) : MEDIAN(cell range)