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