wow those are all pretty low numbers. id say out of my school of 2000(1000 girls) theres at least a hundred or so 8 and above total. imo only one HB10. but then ive probably never given out more than a dozen 10's in my life because they have to be like pristine goddesses to me haha. 250 is a much larger number than 60 though, so kinda hard to count and give a percentage.
my friend goes to a much smaller school with less than a hundred total people per grade kinda like cassanova, and from what ive seen theres only a handful of 8 or above. kinda sucks for him cuz he had to resort to pulling from my school (which he can actually do so its ok for him) in the end i'd say the rate at both schools is about 10% maybe 15 if youre generous, which seems like an accurate assessment in all. and i'm not picky or generous
but then to save that much complication you can always just rate in 0s and 1s, 0s being nay and 1s being a-okay