I just graded Exam #4 for my weekday class. We covered Muscle and Nerve, and those are two very tough topics. Knowing that, I allowed my students to bring in a cheat sheet.
The mean is a 65%, with the following breakdown (the number is the number of students who received that grade):
90-100%: 2I asked the students to report on their exam whether or not they'd used a cheat sheet. One person received a 28% and didn't use a cheat sheet. I hate to be crass, but I don't think a cheat sheet would even have helped this poor soul.
Below 60%: 7