# Math Help - Average value of function over rectangular prism

1. ## Average value of function over rectangular prism

There are two related problems im stuck on.

Average value of: f(x)=ye^(-xy)

Over the box [0,1]x[0,1]x[0,1]

and over the prism [0,5]x[0,3]x[0,3].

I cant find a way around the #/0 problem... help please?

2. ## Re: Average value of function over rectangular prism

Assuming you mean $f(x,y,z)=ye^{-xy}$, you should be able to integrate $\int_0^1 \int_0^1 \int_0^1 ye^{-xy}\, dx\, dy\, dz$. How do you get something divided by 0?

- Hollywood