Add entry to legend

Dear all,
How can I define and add mean value, RMS and chi-squared to a legend l?

Thanks in advance

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How can I actually add (for example) mean value of h histogram in TLegend. I did this:

TH1F *h = new TH1F(*hist);
double mean = h->GetMean();
auto legend = new TLegend(0.1,0.7,0.48,0.9);
legend->AddEntry(h, "data", "l");
legend->AddEntry(mean, "Mean value", ""),

But it`s not working

legend->AddEntry((TObject*)0, TString::Format("Mean value = %g", h->GetMean()), "");

Thanks a lot :smiley:

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