How do you find the average value of a function on a surface?

1. Mar 29, 2012

MeMoses

1. The problem statement, all variables and given/known data
find the average value of (1+4z)**3 on the surface ....

2. Relevant equations

3. The attempt at a solution
All I really want to know is how to go about this? Is the average value on the surface just the surface integral over the area of (1+4z)**3?

2. Mar 29, 2012

Dick

It's the integral of (1+4z)^3 over the surface divided by the area of the surface.

3. Mar 29, 2012

MeMoses

thank you, that makes more sense