They say the average score is 53.3 %: http://profitsrun.com/landing/survey-gold-investing/index5a.php?src=banners I might have beaten it, because it got blocked when I hit "see your score"
The largest gold coin ever minted was produced by the Royal Canadian Mint in 2007, which weighed: I'm pretty sure the 1 tonne coin by the Perth Mint was bigger! Few mistakes in the quiz.