I'm mainly wondering how in the everloving fuck apparently the average guess for "live in new york city" is 30%? Surely that has to be trolls answering 100% skewing the average? The number of nyc residents i have floating around in my head is 20 million for some reason (which as it turns out is already a vast overestimation), which would be around 7% with the 330 million i have floating around for US population (which is pretty close to the real number)

I know the US education system isn't great, but surely people at least have some very basic knowledge about their own country?

The bi thing is almost certainly your bubble. Younger generations (just gonna guess you aren't beyond your mid thirties at most, if yes then I'd find your experience very surprising) skew more towards expressing non-hetero sexualities already, and being around more ideologically left-wing groups likely skews it heavily. It could also be that some people feel some same-sex attraction, but still identify as hetero.

The numbers do seem about right in general, bisexuality is a weird thing bc I'm also quite convinced some degree of it is extremely common, but that doesn't mean all those people identify that way.