1. The problem statement, all variables and given/known data We needed to measure the temperature of a bucket of water using a thermometer which can be read to 0.1°C. Each group would do a single measurement, the data from five groups (including our own) was to be averaged with the uncertainty stated. The data collected was: 19.5 19.5 19.8 20.0 20.3 (all in °C) I'm having difficulty with calculating the uncertainty. 2. Relevant equations ΔZ = ΔX + ΔY 3. The attempt at a solution I have a feeling that I shouldn't be using this equation. Taking multiple measurements and averaging them should give better results, but... if I take more measurements then I have more uncertainties to add which will lead to a greater total error and an overall worse result. I end up with ±0.5°C which doesn't seem right.