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Consider 3 processes whose {X,Y,Z} whose arrival and burst time are given below
Which of the following is/are true?
  • a)
     Optimal non-preemptive scheduling algorithm's average waiting time  = 13/2.
  • b)
     Optimal non-preemptive scheduling sequence is {Y, Z, X}.
  • c)
     Optimal non-preemptive scheduling algorithm's average waiting time  = 8/3.
  • d)
     Optimal non-preemptive scheduling sequence is {X, Y, Z}.
Correct answer is option 'B,C'. Can you explain this answer?
Most Upvoted Answer
Consider 3 processes whose {X,Y,Z} whose arrival and burst time are gi...
Sequence: Y, Z, X
Gantt chart:
Processs Table:
Average waiting time 
= 8/3
Sequence: X, Y, Z
Gantt chart:
Average waiting time 
 = 13/3
Sequence: X, Y, Z
Gantt chart:
Average waiting time 
 = 11/3
Sequence: X, Y, Z
Gantt chart:
Average waiting time 
 = 13/3
{Y, Z, X} is an optimal non-preemptive scheduling sequence that gives 8/3 average waiting time.
Formula used:
TAT=CT-AT
WT=TAT-BT
Hence, the correct options are (B) and (C).
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Consider 3 processes whose {X,Y,Z} whose arrival and burst time are given belowWhich of the following is/are true?a)Optimal non-preemptive scheduling algorithms average waiting time= 13/2.b)Optimal non-preemptive scheduling sequence is {Y, Z, X}.c)Optimal non-preemptive scheduling algorithms average waiting time= 8/3.d)Optimal non-preemptive scheduling sequence is {X, Y, Z}.Correct answer is option 'B,C'. Can you explain this answer?
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