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       9
P2       8
P3       4

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

Process  Burst
P1       7
P2       3
P3       7

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

Process  Arrival  Burst
P1       0        4
P2       1        5
P3       0        9
P4       3        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 SJF (non-preemptive) scheduling, what is the average waiting time for these processes?

Process  Arrival  Burst
P1       0        6
P2       1        4
P3       4        8
P4       0        8