Hi, I am writing a lab report for an equilibrium experiment involving titration of KHP, KHT with NaOH. I have my 3 concordant titres and have worked out the average. the next part of the question asks for "half range titre". I nhave been through all my course materials and cannot find any mention of this. I am assuming this is in relation to the uncertainty and not half of the titre value as the next part of the question asks for the titre volume and uncertainty value. I keep looking at it and it feels wrong but I cant find anything to explain it. Also for the propagation of errors I have been adding the uncertainty values but cant find information on what to do for an average i.e if I have uncertainty of 0.04 in 3 readings propagating to 0.12 but I'm pretty sure when the reading are divided by 3 to get the average the uncertainty does not divide by 3. I could add the percentages but shouldn't the uncertainty value decrease in an average?