
 ProbabilityTheory  PineWiki 
  The usual argument against frequentist probability is that it only works for repeatable experiments, and doesn't allow for statements like "the probability that it will rain tomorrow is 50%" or the even more problematic "based on what I know, there is a 50% probability that it rained yesterday". 
  The probability that we roll a 7 is the sum of the cases (1,6), (2,5), (3,4), (4,3), (5,2), and (6,1), or 6/36 = 1/6. 
  So one of the ways to compute the probability of two events occurring is to compute the probability of one of them, and the multiply by the probability that the second occurs conditioned on the first. 
 pine.cs.yale.edu /pinewiki/ProbabilityTheory (1980 words) 
