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Que. An operating system uses shortest remaining time first scheduling algorithm for pre-emptive scheduling of processes. Consider the following set of processes with their arrival times and CPU burst times (in milliseconds):

Process : Arrival Time Burst Time
P1 : 0 12
P2 : 2 4
P3 : 3 6
P4 : 8 5

The average waiting time (in milliseconds) of the processes is _________.
a. 4.5
b. 5.0
c. 5.5
d. 6.5
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