How do you calculate the average waiting time and turnaround times of a operating system ptdf?

To calculate the average waiting time and turnaround time in a process scheduling algorithm like Preemptive Time Division Fairness (PTDF), first determine the completion time for each process. The turnaround time is computed as the difference between the completion time and the arrival time of each process. The waiting time is found by subtracting the burst time from the turnaround time for each process. Finally, average these values by summing them up and dividing by the number of processes.