Quantile (Percentile) Calculation

[#1]

I have a dataset of 10 numbers: 2,4,5,8,9,10,13,15,17, and 20. I pull those into JMP and split them up in a tabulate table into Quantiles. Output is at Quantiles 5, the value is 2, at quantiles 10 the value is 2.2 and so on. How are these calculated? Thank you! 

[#2]

From the JMP Help: https://www.jmp.com/support/help/en/15.2/?os=win&source=application&utm_source=helpmenu&utm_medium=a...