1st percentile, 2nd percentile... But how to say "2.5th" percentile?
There are only one hundred percentiles. You can not be in the 2.5th percentile.
I feel that 2.5th percentile sounds better than 2.5-percentile. Do you agree?
Yes I do agree. I would pronounce them 'two point fifth percentile'.
I see that Hot Licks said the same while I was typing.
I'm not sure what I would say with, e.g. 2.25 th.