1. The problem statement, all variables and given/known data When a mass of 166.5 ± 3.0 g is added to a spring the spring extends 7.20 ± 0.16 cm. What is the uncertainty in the spring constant, k? You may assume g is known precisely with no uncertainty. 2. Relevant equations 3. The attempt at a solution I just converted the units so 3.0 g = 0.003kg and 0.16cm = 0.0016 m so to find uncertainty I just did (0.003)(9.8)+(0.0016) but that was wrong?? can someone please tell me what I am doing wrong here?