Question $1$: the following table contains information concerning four jobs that are awaiting processing at a work center.

$\backslash$table$[[$Job$,\backslash$table$[[$Job Time$],[($Days$)]],\backslash$table$[[$Due Date$],[($Days$)]]],[$A$,7,15],[$B$,15,21],[$C$,6,17],[$D$,10,16]]$

a$.$ Sequence the jobs using $(1)$ First come, first served, $(2)$ Shortest processing time, $(3)$ Earliest due date, and $(4)$ Critical ratio. Assume the list is by order of arrival.

b$.$ For each of the methods in part $a,$ determine $(1)$ the average job flow time, $(2)$ the average tardiness, and $(3)$ the average number of jhes'at the work center:

c$.$ Is one method superior to the others?