[ROOT] Getting mean of Ntuple variables

From: Aron, Navneet (navneet@SLAC.stanford.edu)
Date: Wed Mar 13 2002 - 22:19:55 MET 

Hi,
Can any one tell me how do we get the mean , rms values of  the various ntuple variables in the root file.
My try is as follows: 

{
gROOT->Reset();
TFile *r = new TFile("g1onaxis.root");
TTree *tree = (TTree*)r->Get("TKR_Hits_In_Lyr_0");
Float_t mean = tree->GetMean();
}

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