You score a 70 on your first COL. The class average is 85, with a standard deviation of 5. Which if the following is true? Question 7 options: a) You studied and prepared enough for the COL. b) Since z = -15, you struggled relative to your classmates. c) Since z = +15, you did relatively well compared to your classmates. d) Since z = -3, you struggled relative to your classmates. e) Since z = +3, you struggled relative to your classmates