Question: What is the primary method used to calculate the 'Mean number of attached subscribers' measurement within a SGSN area in a Core Network's Packet Switched domain?
Option 1: Arithmetic mean of sampled values at pre-defined intervals
Option 2: Geometric mean of total subscribers over a fixed period
Option 3: Median value of subscriber counts from random snapshots
Option 4: Mode of subscriber numbers derived from historical data
Explanation: The correct answer is Option 1 because this measurement is obtained by sampling at a pre-defined interval the number of attached subscribers and then taking the arithmetic mean. This method ensures a representative average of attached subscribers over time, reflecting network usage dynamics. In telecom networks, using an arithmetic mean for such measurements helps in understanding average load and capacity planning for packet-switched domains.