now i understand this is very individual player to player and if you godlike RNG

but my guess would be something along the line of these type of groups

4 warriors 1shaman/paladin healer

1 Paladin 3 mages 1 healer

1 Druid 3 mages priest healer


im guessing Mixed groups will be alil below due to complexity of multiboxing several classes at once
unlesss you happen to be a god of multitasking