Feb 2000 Passage 1, question 7

Admin Note: Edited title. Please use the format: "PT#.S#.Q# (P#)"

In the analytics section for PTs sections are given ratings of easy, medium, difficult. I've found out that these are averaged based on the extent to which 7sagers struggle with a given section. However, isn't this meaningless since the test is designed to be standard? The range of difficulty should change much because there is no curve...thoughts?