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Epiphany comments on 2012 Survey Results - Less Wrong
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Note also that in the last two surveys the mean and median answers were approximately correct, whereas this time even the first quartile answer was too late by almost a decade. So it's not just a matter of overconfidence -- there also was a systematic error. Note that Essay Towards Solving a Problem in the Doctrine of Chances was published posthumously when Bayes would have been 62; if people estimated the year it was published and assumed that he had been approximately in his thirties (as I did), that would explain half of the systematic bias.
I personally had error bars of 75 years on my confidence and was 74 years off. I'm not sure if I translated that correctly into percent certainty of being within 20 years of correct, but I felt okay about the result. This might be another source of systematic error?