aCPU stands for Average CPU. In the shared hosting majority of customers have their sites hit very infrequently, often less than once a minute. Once you average CPU usage for such a customer across 1 day (or an hour or even 10 minutes), the actual CPU usage will often below 1%
This is why when you run lveinfo, you often see aCPU to be 0 or 1. If you see some user using 5-6% of aCPU, this user is using a lot of resources.
You can probably have no more than 10-15 such users on a server (15 users *5%=75% of total CPU resources of the server). So, such users should be either upgraded to VPS or charged correspondingly to their usage.
Why the result is not double type e.g 0.5 like db_gov CPU stats?
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