As rated by students elsewhere, Problem 10 was rated 4 for difficulty, 5 and 15 are both a 3, and 2, 11, 12, 13 and 17 were rated 2, with the rest deemed a 1.

System-recorded median time to complete problems rated 10 as the longest, then 17, then 5, 11, 12, 15, 16 and 17 (which were all the same)