I received this question via email and thought the answer might be sufficiently general to be worth posting here.
I have used the Ryff scale in my research . Actually I am confused about the scoring. The minimum possible score is 54 and the maximum score 324. I calculated this after reversing the negatively worded items. The author of the scale mailed me saying the scale has no cut-off points score you have to consider the upper 25% as higher level of psychological well-being and the scores in the lower 25% as poor psychological well-being.
How would I find the upper and lower 25% (I guess called as Quartile) from just the minimum and maximum score on the scale?