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5 batch jobs A through E arrive at a computer center at almost same time. They have estimated running times of A:10, B:6, C:2, D:4 and E:8 minutes. Their priorities are A:3,B:5,C:2,D:1 and E:8 min. Their(externally determined) priorities are A:3,B:5,C:2,D:1 and E:4 respectively with 5 being highest priority.Ignore context switch overhead.

Q- What will be the mean process turnaround time under R-R scheduling algorithm(assuming time slice of 1 min)?

a) 22 min b) 21 min c) 18 min d) none

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Ans is option D none

ct of process A=30,B=22,C=9,D=18,E=27. And at =0 for all process .

tat = ct-at so tat of A=30,B=22,C=9,D=18,E=27

mean tat = 106/5= 21.2 MIN

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