Help with understanding Rating Systems

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Hey guys so I'm trying to come with a rating system from 1-10 that will be determined based on how close a user is to an average value that I have. I don't have any data(other than the average value) to work with, so standard deviation is not possible. So lets say I want to give a number to a household based off of how many children they have(assume average is 2), if a house has higher than two its value will be a bit higher than 5. Is there any documentation/articles/books I could read to get a better grasp of where to look? Sorry for being a bit vague, but I don't know where the right places to look are in this matter, hope you guys can help!