It is because I have a precipitation raster layer where values are just about normally distributed. I want to leave out e.g. 2,5 percent in each "tail" of the data distribution. This is because this data is very spread out and doesn't have any use value for me.
Using the 32 quantililes I can not mark and leave out less than 100/32=3,125 % in each tail of the distribution, so 6,25 % for both tails together. I would like to include a little bit more than 93,75% of the data - at least 95 %.