1. The problem statement, all variables and given/known data The values for the charges on oil drops are 3,99 6,65 2,66 10,64 3,99 and 9,31 all these multiplied with x10-19C. What is the largest value of the fundamental unit of charge that is consistent with the measured charges? 2. Relevant equations Fundamental unit of charge is e=1,60x10-19C 3. The attempt at a solution The question confuses me a little bit. Taking mean average is useless because the highest value is asked. I don't find also any reason to calculate ratios between the measured values althought 6,65/3,99=1,6666... Any ideas?