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Ouch. Does that imply that finishing in the top 80% of your class then put you somewhere near the bottom 33% of developers?

You are assuming that the best CS majors must obviously want to be commercial developers.

People go to grad school in other disciplines (sciences, stats, etc.) which can take advantage of computation, for one thing.

Wouldn't that depend on the correlation between class grades and developer skill? I have no idea about that.