# Integrals for average histograms

So I made 3 histograms one of which was the average of the two where I divided to make:
h3->Divide(h1,h2). After I did that I took the integral of h3 from 600-800 by doing:
h3->Integral(h3->FindFixBin(600),h3->FindFixBin(800)). However I was told that the value I get for the integral is incorrect. Can someone explain mathematically why this is?

Hi Zach,

What makes you think the `h3` is the average of `h1` and `h2`? It’s the ratio of these two, but not the average.