Quintet - Jim Bryant, The Jets, Marni Nixon, Sharks, Betty Wand (track) by Various Artists
From the album West Side Story (The Original Sound Track Recording) (track #11)
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Outliers can be removed when calculating a mean average to dampen the effects of ratings outside the normal distribution. This figure is provided as the trimmed mean. A high standard deviation can be legitimate, but can sometimes indicate 'gaming' is occurring. Consider a simplified example* of an item receiving ratings of 100, 50, & 0. The mean average rating would be 50. However, ratings of 55, 50 & 45 could also result in the same average. The second average might be more trusted because there is more consensus around a particular rating (a lower deviation).
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This track has a Bayesian average rating of 76.7/100, a mean average of 76.9/100, and a trimmed mean (excluding outliers) of 76.9/100. The standard deviation for this track is 15.6.
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