Ask HN: Unanswered questions?This question is a bit tongue-in-cheek, but I'm starting to hit more and more very basic questions where nobody seems to know the answer.Here is a question I just posted on stack overflow about weighted variance and weighted standard deviation:http://stackoverflow.com/questions/16761965/weighted-variance-and-weighted-standard-deviation-in-cI vaguely remember studying this in college, we had one lecture where the professor talked about variance when the samples are weighted. The very first question in my mind was whether:variance( { 1, 2, 3, 3 } )would equal the weighted variance:variance( {1, 2, 3 }, { 1, 1, 2 } )I can't remember the answer. Unfortunately, nearly every interesting topic in mathematics has an initial "what if" that goes with it. But for whatever reason, a lot of the math discussions on the web lack the answers to these. It's like people are regurgitating the formulas they learned by rote memorization, instead of providing the derivations.I don't honestly expect this que