How much can the average person that makes 12000 dollars annually get back on their income tax refund with no other dependents?

It would depend on how much was taken out by the government. Try using an online service to see how much your return might be.

Example:

https://turbotax.intuit.com/login/start.jsp?priorityCode=4647800000&productid=512&abtest=PONHelp%3DC