Average means 50% to 50%. So half of population is smarter then average and half of population is dumber. Still intelligence is thing difficult to describe. It is main reason why IQ doesn't measure intelligence. IQ tests measure level of ones skill at writing the test. If you even would say average level is rather low, do you determine yourself also lower, or maybe not high enough to rise average higher.

When it comes to The Sun, compare UK population to sells of the Sun. Also being misinformed dean't mean someone is stupid.