that you’ve performed better than (100 – blank) percent of others who have done the same thing / have been surveyed.
if at school you’re in the top 10 percent of a test, it means that 9 out of 10 others got worse marks.
if you’re smoking and are in the top 5 percent risk group for lung cancer that means 19 out of 20 other people have a lower risk.
etc.
can be good, can be bad, can be meaningless if the base group is badly selected.
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