I'm Finnish and we're definitely not as wealthy as Norway, and the 7€ is an average, and I'd say skewed for some reason. I live in one of the main cities in Finland, not a large one, but large for a Finnish one. It's very common to have to pay 8,5€ for a 0.33l (11,15floz) basic lager in the restaurants, cafes and bars that are in the center. It's disgusting.
There are a few cheaper places, but any non-sleazy place basically.