The following list of jobs in a critical department includes estimates of their required times:

JOB	REQUIRED TIME (DAYS)	DAYS TO DELIVERY PROMISE	SLACK
A	1		6		5
B	11		5		6
C	8		10		2
D	6		9		3
E	15		4	(late)	19
F	3		6		3
G	2		7	(late)	9
H	4		6		2

a. Use the shortest operation time rule to schedule these jobs. What is the mean flow time? (Round your answer to 3 decimal places.)

b. The boss does not like the schedule in a. Jobs E and G must be done first, for obvious reasons. (They are already late.) Reschedule the jobs by assigning E and G first and second, respectively, and then assigning the remaining jobs using the shortest operation time rule. What is the new mean flow time? (Round your answer to 3 decimal places.)