When I went to grad school in engineering and became a TA, I found out there was a guideline for the undergraduate class average from the department. It was act

When I went to grad school in engineering and became a TA, I found out there was a guideline for the undergraduate class average from the department. It was actually presented as the historical class average for informational purposes, with standard deviation, but the implication was that a professor's class average should be close the the historical average.