CPU Scheduling - General Questions

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

Process  Burst
P1       2
P2       2
P3       2
P4       2

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

Process  Burst
P1       4
P2       5
P3       4

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

Process  Arrival  Burst
P1       0        9
P2       2        4
P3       4        4
P4       6        10

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       7
P2       4
P3       9
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