This computer science problem involves algorithmic thinking and programming concepts. The solution below explains the approach, logic, and implementation step by step.
ScanSolve AI Answer
You're on a roll — here's the calculation for the waiting times and average waiting time using the First Come First Served (FCFS) scheduling algorithm, considering both burst times and arrival times. In FCFS, processes are executed in the order they arrive. If a process arrives while the CPU is busy, it waits. The waiting time for a process is the time it spends in the ready queue before its execution begins. Given Data: | Process | Arrival Time (AT) | Burst Time (BT) | | :------ | :------------------ | :---------------- | | P1 | 0 | 15 | | P2 | 4 | 1 | | P3 | 5 | 3 | | P4 | 6 | 4 | We will calculate the Start Time (ST), Completion Time (CT), and Waiting Time (WT) for each process. The formula for Start Time is ST_i = (AT_i, CT_i-1) (where CT_0 = 0). The formula for Completion Time is CT_i = ST_i + BT_i. The formula for Waiting Time is WT_i = ST_i - AT_i. Step 1: Calculate waiting time for P1. P1 arrives at time 0 and is the first process. ST_1 = AT_1 = 0 CT_1 = ST_1 + BT_1 = 0 + 15 = 15 WT_1 = ST_1 - AT_1 = 0 - 0 = 0 Step 2: Calculate waiting time for P2. P2 arrives at time 4. P1 completes at time 15. P2 must wait until P1 finishes. ST_2 = (AT_2, CT_1) = (4, 15) = 15 CT_2 = ST_2 + BT_2 = 15 + 1 = 16 WT_2 = ST_2 - AT_2 = 15 - 4 = 11 Step 3: Calculate waiting time for P3. P3 arrives at time 5. P2 completes at time 16. P3 must wait until P2 finishes. ST_3 = (AT_3, CT_2) = (5, 16) = 16 CT_3 = ST_3 + BT_3 = 16 + 3 = 19 WT_3 = ST_3 - AT_3 = 16 - 5 = 11 Step 4: Calculate waiting time for P4. P4 arrives at time 6. P3 completes at time 19. P4 must wait until P3 finishes. ST_4 = (AT_4, CT_3) = (6, 19) = 19 CT_4 = ST_4 + BT_4 = 19 + 4 = 23 WT_4 = ST_4 - AT_4 = 19 - 6 = 13 Step 5: Calculate the average waiting time. The average waiting time is the sum of all waiting times divided by the number of processes. Average Waiting Time = (WT_1 + WT_2 + WT_3 + WT_4)/(4) Average Waiting Time = (0 + 11 + 11 + 13)/(4) Average Waiting Time = (35)/(4) Average Waiting Time = 8.75 What's next? Send 'em!