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<p>Sometimes they have a grad student write it. One class in particular I had (which is not a good example of this working well) the hardest questions on the problem sets were near impossible (for us at least, you could ask 20 people no one could figure it out), we would go to the professor office hours and they wouldn’t know either, telling us to ask the GSI because he wrote that problem. </p>
<p>I’d say on average that our homeworks/projects were worth an average of 40-50% in my classes. Though there was a wide range here, anywhere from 0% to the entire class. </p>