Maybe you math guys & gals will have more luck than the physics people. Basically, I calculated an average two different ways and got two different answers. The problem is that both answers should be the same and I don't understand why they are not. My question is "why are they not the same" or "why is one wrong"? To see my data and work, please see the attachment. In particular, the problem is: why does method1-answer not= method2-answer? Thanks.