Coefficient of variation
From ACT Wiki
A measure of the variability of a distribution, expressed as a proportion of the expected value.
It is calculated as: [Standard Deviation]/[Expected value].
For example;
if the Standard deviation of the Net Present Value of a project = $100m,
and the Expected Net Present Value = $50m, then:
Coefficient of variation
= $100m/$50m
= 2.0.