I have a question. I am working on a particle technology question. I am to calculate the rate of reduction of a 1000um feed. I wasn't given the mass retained before or after for that size but I have details for a size bigger and a size smaller. Do I interpolate to get for that of 1000um?

I know how to plot Gaudin-Schumann and Rosin-Rammler distribution curves when I am given mass retained for each feed size but how do I estimate from those plots, the mass fractions of sizes that are not given in the question?