Metacritic system compromise with calculations. Halo 4 really is at 90% not 87%

[DaHuuuuuudge]

I like the use of statistics, but however this is a moot point. The curve for the charts isn't normally distributed (it's highly negatively-skewed), so 1.5 IQR would not help you with much of anything, just like using a z-score wouldn't help you with this distribution.