So my observations are as follows, with their individually corresponding probabilities:
18 => 10%
18 => 20%
40 => 20%
90 => 20%
90 => 10%
110 => 20%
Should equal observations be summed as follows since I have to observations of 18 and two of 90?
18 => 30%
40 => 20%
90 => 30%
110 => 20%
Does it give any meaning to calculate the 1st percentile (P1) for these observations? I can't figure out whether it should be 18 or 0. I need to calculate all percentiles from 1 to 100 in order to plot the cumulative distribution.
What is P10?
What is P30?
What is P100?