Pretty basic math question, but I really haven't taken Statistics since the AP in HS. The basics are... There are several thousand things (genes) that are measured and have a numeric value. Each of these numeric values has an associated error with it. There are six trials for EACH of those (thousands) of genes with the error also. What I am trying to do is to find the average value and the associated error for each of the genes seperately. The average value, I'm thinking just simple arithmetic mean, but I'm at a loss for how to approach the error.