spartanag07

I know what you're talking about and I have the same confusion-- between the formula for L(y) in the ordered list of numbers in the set and what I saw on a mock exam and the explanation.

The question I think I recall described 10 items in a list and asked for the 80th percentile and the correct answer was the 8th number, not the interpolated number you would arrive at if you used the formula. I still remain confused. It seems like common sense that if you have a set with 10 numbers the 8th number would represent the 80th percentile... but obviously that's not what the formula produces and on that mock, the interpolated answer choice was not correct.