Please someone explain how to do this.

8. Compute the average response time when running three jobs of length 10, 15, 30 seconds using round robin scheduling. Assume the jobs arrive at the same time, and that each time slice is 1 second long. 9. Compute the average turnaround time when running three jobs of length 10, 15, 30 seconds using round robin scheduling. Assume the jobs arrive at the same time. Assume each time slice is very short -- you do not need to know the exact length of the time slice to solve the problem. 10. Assume jobs A, B, and C have lengths 10, 20, and 30 seconds respectively. Assume job C arrives at time 0, job B arrives at time 5, and job A arrives at time 10. Compute the average response time. Don't forget that the response time for a process begins when a process is ready for service. Use shortest-time-to-completion-first as the scheduling policy. 11. Assume jobs A, B, and C have lengths 10, 20, and 30 seconds respectively. Assume job C arrives at time 0,job B arrives at time 5, and job A arrives at time 10. Compute the average turnaround time. Use shortest-time-to-completion-first as the scheduling policy