# Average value gaussian

1. Nov 16, 2006

### thenewbosco

The question says show that the average value of k is $$k_0$$ for the function $$A(k)=\frac{1}{\sqrt{2\pi}a}e^{\frac{-(k-k_0)^2}{2a^2}$$.

I know that this is a gaussian function and that the center is k0 but i am not sure how to show this is the average value of k, what equation for average value would i evaluate. is it some kind of integral? and are the limits + and - infinity?

2. Nov 17, 2006

### HallsofIvy

Staff Emeritus
For any probability distribution, f(x), the "average" value (more correctly, the mean value), also called the "expected" value, is given by
[tex]\int xf(x)dx[/itex]. While $e^{x^2}$ does not have an elementary anti-derivative, putting that additional x in makes it easy to integrate.