The following questions refer to the table data for jobs awaiting processing at a single work station $($jobs are shown in order of arrival$)$:

$9$

$--$

$12$

$--$

$15$

$==$

$7$

$18$

$--$

$20$

$21$

$23$

$24$

Job

Processing Time $($days$)$

Due Date $($days$)$

$3$

$2$

$5$

$6$

C

$7$

$10$

D

$4$

$4$

E

$5$

$8$

What is the average job lateness for the first come, first served $($FCFS$)$ priority rule schedule? $($N$.$B$.$:

Round to $2$decimal$$places$)$