Rwanda is rank 122 and Nigeria is rank 31 place.
These rankings don't matter much anymore, just look at where Nigeria is in the table:
https://www.skysports.com/fifa-world-cup-african-qualifying-tablesee that Rwanda even surpassed South Africa in the table, at least for now, my point is that the bookmakers do not offer money, when they put odds of 2.00 for the favorite, Is because of the analyses they did they concluded that there is a high risk of the favorite losing, as I have seen that in this thread there is a lot of talk about the Nigerian national team, so I thought I would see odds of 1.20 in favor of Nigeria, because that would mean that many people believe that Nigeria would win easily, even because I see Nigeria with a much better squad than Rwanda
There are metrics bookmakers use in determining these odds. The popular way gamblers pick their teams is to go through past data on matches played and making their predictions based on the information they gathered. Rwanda beat South Africa by two goals to nil remember therefore this data will also influence the odds. But Nigeria is a different and stronger team, I am happy that we won comfortably yesterday.