# Average fluctuation

1. Jan 27, 2010

### Phyisab****

1. The problem statement, all variables and given/known data

I have been asked find the average fluctuation in a certain value. But I don't know what that means. Say x fluctuates about a mean.

$$(\overline{(\Delta V)^{2}})^{1/2}?$$

But that's the root mean square fluctuation, which isn't the same. Then how about

$$\overline{\Delta V}$$

now that's the average fluctuation right?
But if I only know the average value, and the root mean square fluctuations, then how can I find the plain old average fluctuation from that?

Last edited: Jan 27, 2010