If the 80 percenile of a dataset is the value A, then
- A >= 80% of values
- at least 80% of the values <= A
- at least 20% of values are >= A
Are these logics correct as per the GRE?
I am majorly concerned about “<=”, “>=”, and the word “at least”.
They aren’t strictly committed to one definition (inclusive vs exclusive), so it’s sufficient to just say: “A is approximately above 80% of all the data in its set”
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