covariance average

Hi all.

CV measures are often used as quality controls for quantitative laboratory assays.

How can I calculate simply averaging CV values across CV values for multiple samples within one assay or average multiple inter-assay CV?

Is it a simple average, or do i have to sum all CV^2 and SQR them?

I'm having a hard time finding good info (that i can understand) online.

Thank you all.