CPU Scheduling - General Questions

Using Round Robin (quantum 2) scheduling, what is the average waiting time for these processes (all arrive at time 0, in order)?

Process  Burst
P1       6
P2       5
P3       5

Using Round Robin (quantum 2) scheduling, what is the average waiting time for these processes (all arrive at time 0, in order)?

Process  Burst
P1       10
P2       8
P3       2
P4       8

Using FCFS scheduling, what is the average waiting time for these processes (all arrive at time 0, in order)?

Process  Burst
P1       7
P2       8
P3       8
P4       9

Using Round Robin (quantum 2) scheduling, what is the average waiting time for these processes (all arrive at time 0, in order)?

Process  Burst
P1       8
P2       5
P3       3
P4       4

Using SJF (non-preemptive) scheduling, what is the average waiting time for these processes?

Process  Arrival  Burst
P1       0        2
P2       0        9
P3       2        4