CPU Scheduling - General Questions

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

Process  Arrival  Burst
P1       0        5
P2       1        8
P3       4        3
P4       3        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       10
P2       8
P3       2
P4       8

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       4
P2       10
P3       4
P4       3

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

Process  Burst
P1       7
P2       5
P3       7