Expanding random N(0,1) variable If I have an expression 
$$\frac{1}{1+\sigma m(z/l)}$$
where $m(z/l)$ is a random $N(0,1)$ variable, $\sigma$ is dimensionless, can I rewrite this via an expansion to bring up the random variable on the numerator?

If you want to use $$\frac1{1+x}=1-x+x^2-x^3+\cdots$$ 
then you need to remember that this only works for $|x|\lt 1$
and that a random variable with a normal distribution has a positive probability of being outside this
