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Hello! I have an experiment and for some reasons I was able to do only 4 measurements and they all ended up having the same value, say for the purpose of this post ##100 \pm 1## where the error of 1 is estimated based on the measuring device resolution. The mean is obviously 100. Usually the error on the mean would be ##\sigma/\sqrt{N}##, where ##\sigma## is the standard deviation of the measurements, which in this case is zero. So based on that I would have to quote an error on the mean of zero, but that seems wrong. I can't be 100% sure about my measurement. But also using 1 as the error on the mean seems too big. How should I calculate my error on the mean? Should I use ##1/\sqrt{4}=1/2##?