Five jobs A, B, C, D and E are waiting in Ready Queue. Their expected runtimes are 9, 6, 3, 5 and x respectively. All jobs entered in Ready queue at time zero. They must run in _____ order to minimize average response time if 3 < x < 5.
(A) B, A, D, E, C
(B) C, E, D, B, A
(C) E, D, C, B, A
(D) C, B, A, E, D


Answer: (B)

Explanation: We will solve it by minimizing the avg Waiting Time and Take x = 4

BT = Burst or Execution time
CT = completion time
P = Process
AWT = Average Waiting Time
AT = Arrival time
WT = Waiting time

We get minimum average waiting time from the sequence given in option (B)


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