Drew Christianson
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 Dec 13 comment Probability of picking certain things from a set In any sample? Or some specific size? Dec 12 revised Simple probability problems deleted 293 characters in body Dec 12 revised Simple probability problems deleted 293 characters in body Dec 12 revised Probability cut-off added 90 characters in body Dec 12 comment Probability cut-off Nice catch, I was playing around with sample size and proportion to get the effect I wanted for the example and it looks like I forgot to change the numbers all the way through. My intention was n=500, p=.5, I think everything matches now. You're right on the summand too, mine underestimates the probabilities by a bit. Dec 12 revised Probability cut-off deleted 2 characters in body Dec 12 comment Use Standard Deviation to find Percentage above a certain point @dilip thanks for the reference, I appreciate it. Dec 12 revised Use Standard Deviation to find Percentage above a certain point added 280 characters in body Dec 12 comment Use Standard Deviation to find Percentage above a certain point @henry I'm not familiar with that adjustment, or at least the term. I'm only just finishing up a probability theory course. Link? Dec 12 revised Use Standard Deviation to find Percentage above a certain point added 3 characters in body Dec 12 answered Use Standard Deviation to find Percentage above a certain point Dec 12 comment Use Standard Deviation to find Percentage above a certain point @nick what mixedmath is saying is that saying something is Normal implies that the data is continuous. Saying a discrete sample space is Normal has little meaning. Moreover, even if your data were continuous, saying they're normal without specifying the parameters (mean and SD) has even less meaning. Perhaps you could supply a bit more context? Where did this problem come from? How do you know the data are well approximated by a normal distribution? What are the parameters of that distribution? Dec 11 answered Prove $\int_{a}^{\infty}f'(x)/f(x)\sin(f(x))dx$ converges Dec 11 awarded Suffrage Dec 11 comment How can I find the square root using pen and paper? Yea, certainly seems the most practical. I first saw it on exam question beginning "you're on a desert island with only a 4-fucntion calculator and need to calculate $\sqrt{13}$ Dec 11 revised How can I find the square root using pen and paper? edited body Dec 11 awarded Citizen Patrol Dec 11 answered inference rules application (introduction / elimination): two examples Dec 11 comment What is an efficient nesting of mathematical theorems? Great question. Better minds than I will have actual answers for you; I just wanted to suggest that you cross-post this to mathoverflow as well. That site is geared toward research-level mathematics, and may have other answers for you. Dec 11 answered probability textbooks