What is the average acceleration?

[InSpiRatioNy]

Homework Statement

I'ts part of a bigger problem, but this is all the info given.
http://img238.imageshack.us/img238/7923/chartro3.jpg

Homework Equations

I'm doing an experimental error calculation, and that equation wouldn't relevant, but that's the only one I got.

The Attempt at a Solution

I wanted to slowly minus them together, but it would take really long since there are 12 points, there must be a shorter way, and the margin given for it (it is generally expected to fit) is too small to contain that much work.

 

[Redbelly98]

... that equation wouldn't relevant, but that's the only one I got.

I'm having trouble understanding what you are trying to do. For example, that statement makes no sense to me. I see no equation in your post or the link you gave.