Soccer Strategy-Goals Under/Over 2,5 selection

This strategy is based only on statatistics.How many goals both teams scores and concedes.To do that we take first home teams average of goals scored and conceded at home.Secondly we take away teams average of goals scored and conceded in away matches.
Home team (HT),for example scores 2,2 and concedes 0,96 goals per game.That makes total 3,16 (2,2+0,96) goals per game.
Away team (AT),for example scores 1,3 and concedes 0,75 goals per game.That makes total 2,05 (1,3+0,75) goals per game.
Now we see that HT average of goals in one match is 3,16 and AT average of goals in one match is 2,05.That gives us 2,605 goals between these teams.
This tells that this game can go either way - no bet.
If total average is more than 2,8-2,9 or more it should be an over bet.
If total average is less than 2,3-2,2 or smaller it should be an under bet.
Of course this is not a rule,it simply gives us some point of view to go forward.
To us this system is also good to check injuris and suspensions!There may be some missings in teams etc.