What is the different percentiles and how do we find the lowest and the largest nonoutlying value?

It is 25th, 50th and 75th. To find the lowest nonoutlying value you take the 25h percentile and - it with 1,5 and multiply(*) with IQR. To find the highest nonoutlying value you take the 75th percentile and + it with 1,5 and mulitply it with the IQR. THe IQR is 75th percentile -25th percentile