Question

I really need some help on this one I have been on it for hours ans still cant get it right....

Below are 36 sorted ages of an acting award winner. Find P80
20, 22, 22, 24, 25, 28, 28, 29,29,30,34,35,35,36,37,39,44,48,49,51,51,51,54,56,57,58,63,66,67,72,72,74,76,77,79,80
It keeps giving me the equation L= k/100 * n

Answer 1

P80 = 36 * 0.80 = 28.8
The above equation shows that the 80th percentile will have 28.8 values below it. So obtaining the 29th value will be the 80th percentile so the value at P80 = 67.
hope it helps