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        4
P3       4        9

Which scheduling algorithm can cause starvation of long jobs?

Turnaround time is:

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

Process  Arrival  Burst
P1       0        10
P2       2        9
P3       4        3
P4       0        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       5
P2       8
P3       2