Median sale price data is determined by the price of the properties that falls in the middle of the total number of properties sold over a period.
The median is the middle number in a sorted list of numbers. Therefore, if the sale price of three separate properties were to be $600 000, $620 000 and $700 000 then the median sale price would be $620 000.
For more information on where the median sale price are sourced from, click through here.