$($ Please handwrite and explain i want to understand $)$

The table below lists the arrival times to the ready queue and CPU burst times for $4$ processes P$1,$ P$2,$ P$3$ and P$4$:

A$.$ Find the Start time and End time of each process assuming the CPU uses FCFS scheduling

B$.$ Repeat assuming that the CPU uses Round$-$robin scheduling with the quantum equal to $5.$

C$.$ Draw the corresponding Gantt chart for the above two cases a and b$.$

D$.$ Compare the average waiting time of the $4$ processes in both cases:

The average waiting time under FCFS $=$

The average waiting time under $\backslash (\backslash$mathrm$\{$RR$\}=\backslash )$

E$.$ Write your comment