What do you think the SD of the scores in Volume 6 is? The way I see it, according to the performance tracker the average score is 67 on the final 3 tests in the book. Can we construct a hypothesis test to find out what the top 40% of all the scores would be. This would give a better indication of where we stand, no? P.S. The fact that I am even thinking about these things is really sad. I need my life back.p