This is not an old one. It is from the 2019 Specialist Exam 2 and comes courtesy of student PURJ, who previously contributed to the discussion here. PURJ noted one, glaring, issue with the question below and its grading, but we think there are other issues as well. As with our previous WitCH, we’ll semi-update with excerpts from the examination report once people have had a chance to ponder and to comment.
To move this along a little, we’ll note that the examination report gives the solution to (b) as
To add to the discussion of (b), the following is the examination report’s comment:
While most students stated the correct range, a significant number gave a domain which did not account for the restriction on t.