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Part $1$: Scheduling $(10$ points$)$

$($a$)$ A FIFO scheduler receives three jobs $($A$,$ B$,$ C$),$ each with arrival time of $0$ second. Process A has run time of $60$

second, whereas Process B and C have runtime of $10$ second. What is the average turnaround time? $(5$ points$)$

Average Turnaround time $($in seconds$)$: $70$sec $($assuming A started first$)$

If you made an assumption that B or C started first, and the calculation was

correct, you were given full points.

$($b$)$ Now consider, Job A has $60$ second run time and arrives at time $0$ second. Process B and C has $10$ second runtime,

and arrive at time $10$ second. For STCF $($shortest time to completion$),$ what is average turnaround time? $(5$ points$)$

Average Turnaround time $($in seconds$)$: $36\mathrm{.}6$ sec