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Chapter 3 · SoftwarePractice
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CONCEPT PRACTICE

Round-robin scheduling

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2026 Spring · Subject A · Q15

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Four processes P1, P2, P3 and P4 arrive at time zero in that order. Their CPU-execution times are 5, 13, 4 and 8 milliseconds, respectively. The time slice is 5 milliseconds. Determine the average waiting time under Round Robin, including time waiting between time slices.

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Source: 2026S_FE-A_Questions.pdf, PDF page 8. ID: 2026S-A-Q015. Explanation written for this textbook.

Original question · Q15
Four processes P1, P2, P3 and P4 arrive at time zero in that order. Their CPU-execution times are 5, 13, 4 and 8 milliseconds, respectively. The time slice is 5 milliseconds. Determine the average waiting time under Round Robin, including time waiting between time slices.

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