I am currently monitoring average closing time for tickets month wise. However, I need average closing time for first 100/first quartile of tickets month wise.
ID Open Time Close Time Month
1 10 20 Jan
2 20 25 Jan
3 20 30 Jan
The average closing time (Close time-Open Time) for first 2 tickets for Jan would be 7.5
I tried this using set expression but that didn't work.