Mean and RMS from data rather than from the fit

For the AFE characterization for the review it would be very useful to implement the calculation of the mean and RMS using a formula and to add the calculated values to the threshold and noise distribution plots, since sometimes values obtained with the gaussian fit are a bit different from the calculated ones. It would be also very helpful to add the mean and RMS to the TOT distribution plot. Is is possible to add this, please?