Perception Gap

Trivia. I've been wasting time taking the Guardian's latest perception gap quiz, you know, the one where you're asked some  questions about the population of your country and you get to see whether you are better informed than the average citizen. So in 8 out of 11 questions I did better, usually much better, than the UK average and was pretty much on the money. In 3 I was a bit off target and slightly worse than the UK average. The summary conclusion from the Guardian's algorithm was:  

I don't know the UK as well as people in the UK :(

Uh? Given my pattern of results this is a bit counter intuitive. I'd love to know how the aggregation worked. Hey, who knows? Maybe a life-time of doing quantitative social science means I don't know shit about my own country. I'd be the last to dismiss the possibility. Or maybe this is just the usual Grauniad bollocks. 

Here's my totally speculative guess. Somebody has implicitly given more weight to questions where the responses are scaled in millions of people than to questions where the responses are scaled in terms of percentages.