Some points, before I answer:
-what is average? IQ of 100? average US citizen? average global citizen? average "non-third-world" citizen?
-TypeC is certainly for the most part more intellegent than the "general population" of say, the US. For the most part people speak in fairly good grammar and spelling (yes, spell check, but still) which is an indicator of education - consider how many people in the US haven't finished high school, let alone haven't gone to college. I'm not sure what the average is for here but I would guess around 115-125 on the IQ scale, and probably closer to 120. (assuming the general population is 100, which is kinda suspect).
I've been in school long enough to have a pretty good sense of where I fall compared to others, how easily concepts are learned and understood etc.
In high school I was easily in the top 10%, I would say 1% or less but I would only be guessing at that point.
In undergrad I was easily in the top....25%, again I would say less but I can't know the intelligence of others very accurately.
In grad school is where I finally! meet people on a daily basis who impress me with their intelligence, and it's the first time I've seriously struggled to understand academic things. It rocks. On a given day/mood I could consider myself well below average (of my peers), average or sometimes above average. I'm definitely above average in some areas and below average in others so....average overall, I guess. Some days I'm noticeably below average/expectations which is...jolting to say the least. I've never had that before (academically of course, I'm below average in many many non-academic areas).
So it really depends on your reference point for what is average.