Nine Five And Two

Three jobs arrive on a single CPU. The scheduler is STCF (preemptive shortest time-to-completion first) and preempts the instant a shorter-remaining job becomes runnable. Context switches are free.

Job	Arrival (ms)	Run time (ms)
A	0	9
B	2	5
C	2	2

Recall $T_{turnaround} = T_{completion} - T_{arrival}$ and $T_{response} = T_{firstrun} - T_{arrival}$.

What are the average turnaround time and the average response time?