I have the read the definitions many times and I still don't quite understand the difference.

This article says:

A statement such as:

"A score of 600 has a percentile rank of 80"

has a different meaning from a statement such as

"The 80th percentile is 600"

Why is the meaning different? What would be an easy concise example that shows the difference?

  • $\begingroup$ The very next statement in that article answers your question with "The first of these two statements says that 80% of the population had scores that were less than 600, while the second statement says that 80 percent of the population had scores of 600 or less." $\endgroup$ – whuber Aug 5 '15 at 22:22
  • $\begingroup$ Thanks @whuber, so is it really just a < vs <= difference? $\endgroup$ – Josh Aug 5 '15 at 22:24

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