Please help me understand and solve these questions. Thanks in advance.

17. Given the following data Process Arrival Time CPU Burst Time Priority 15 5 (lowest 1 (highest) 18 12 (a) Draw the Gantt chart for First-Come-First-Served (FCFS) scheduling. What is the average waiting time? (b) Draw the Gantt chart for Shortest-Remaining Time-First (SRTF) scheduling. Note: preemptive scheduling. What is the average waiting time (c) Draw the Gantt chart for Round-Robin (RR) scheduling using a time quantum (time slice of 5. What is the average waiting time? (d) Draw the Gantt chart for preemptive priority scheduling. What is the average waiting time