create ranking

[q250]

thing №	property1	property2
1	5	6
2	7	9
3	6	10
4	1	7
5	2	5
6	3	4
7	4	3
8	8	2
9	10	1
10	9	8

lets say we have some 10 things. these things have property1 and property2, and we rank those things by property1 and property2 in in decreasing order respectively. now question: how to make function F such that will take ranking number of property1 and ranking number of property2 and output how it called, average value, median, etc i.e create new ranking method that will take into account property1 and property2 together. exact values of properties is not given, only ranking numbers. random table for example.