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Hello! I have some measurements with errors associated with them: ##x_i \pm \delta x_i## and I want to cite the value of the mean with its error. I see online that the error on the mean is defined as ##\sigma/\sqrt N##, where ##\sigma## is the standard deviation of my measurements and ##N## is the number of measurements. However, this formula seems to ignore the error on the individual data points. How should I compute the error in this case? Thank you!