1. For this discrepancy, I would need more information from the bookings/events on the 12th Sep, to confirm that there are only 10 pax for this function room in the morning.
2. For Vibhavadee Ballroom ABC, the Monthy Average % Occupancy is referring to average occupancy percentage (%) for the month.
In this case, for morning, the total percentage for the month is 540.
So the calculation will be (540 / (30days * 100%) ) / 100 = (540/3000) * 100 = 18%. So the average occupancy percentage for Sep 2015 is 18%.
For Lunch it would be (783/3000) * 100 = 26%, etc.
3. For this issue, I would need more information from the Delphi application on the 12th Sep. If you can send us the Event List report for 12th Sep, it would be helpful.