To address the specific example of having only a single rating of 5, the
algorithm would spit out about a 4.5 (5 is the sample median, but since
the sample size is so low there is a very wide error bar on the
probability estimate a new voter would rate below that, and we take the
lower bound)

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https://bugs.launchpad.net/bugs/894468

Title:
  Statistics algorithm for sorting ratings looks fishy

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