Question $2$: $[15$ marks$]$

Suppose that we have the table below that includes four processes with their Arrival times

$($in ms $)$ and Burst times, and a SRTF $($preemptive$)$ scheduling policy is to be used for

CPU scheduling. Answer the following questions:

a$.$ Draw the Gantt chart.

$(6$ marks$)$

b$.$ Complete the above table.

$(6$ marks$)$

c$.$ Calculate the average waiting time.

$(3$ marks$)$