Dear all,

I am working on RooFit but get stuck here. I need to do fits with a RooFFTConvPdf which is the convolution of a RooKeysPdf and a Gaussian distribution. The fit is fine but i do not know how to get the mean value (not the maximum) of this p.d.f. Also I want to find an interval around the mean value whose integration is 0.9973 (half, 0.9973*0.5, on the left side and half on the right). But without the knowledge of the mean of the p.d.f the further work seems impossible.

Thanks for help!

Update:

It seems my idea has some problems.