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

[MeMoses]

Homework Statement

find the average value of (1+4z)**3 on the surface ...

Homework Equations

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?

 

[Dick]

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

 

[MeMoses]

thank you, that makes more sense