What exactly is it you want to calculate an average from? You say you want to average the first 10 and then the next 10...which sound OK, then it's just creating an averaged graph, but you also say that in between the averages there are 6 values you don't want. Are you saying that you want the average of the first 10, then the average of values 16-25..then 32-41 etc..?
As soon as I know exactly what data you want to use for the averaging and how you want the result presented I can make it for you.
