All trucks entering the newly constructed skyway from NLEX to Alabang are required to stop at a weigh station. Trucks arrive at the weigh station at a rate of 200 per 8-hour day, and the station can weigh, on average, 220 trucks per day.

1. Determine the average number of trucks in the system
2. Determine the average time of trucks in the waiting line.
3. Determine the average number trucks in the waiting line.
4. Determine the probability that there no trucks in the system