
 CONK! Encyclopedia: Probability (Site not responding. Last check: 20071105) 
  He represented the law of probability of errors by a curve y = Ï(x), x being any error and y its probability, and laid down three properties of this curve: (1) It is symmetric as to the yaxis; (2) the xaxis is an asymptote, the probability of the error 
  The probability of an event is generally represented as a real number between 0 and 1, inclusive. 
  For example, if two mutually exclusive events are assumed equally probable, such as a flipped coin landing headsup or tailsup, we can express the probability of each event as "1 in 2", or, equivalently, "50%" or "1/2". 
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