(a) If your sampling plan is not based on service grouping, you should multiply your sample average for the entire sample with the annual total of your corresponding expansion factor to get an estimate of the annual total.

(b) If your sampling plan is based on service grouping, you should take a two-step approach:

(1) Multiply your sample average with your corresponding expansion factor for each group, and

(2) Sum the above products across all groups to get your annual total.