Five jobs are ready for processing at time zero through a workstation. The details of the processing time and the due date of completion is provided in the following table.
$\begin{array} { | l | l | l | }
\hline \text { Job } & \text { Processing Time (days) } & \text { Due Date } \
\hline \text { A } & 5 & 11 \
\hline \text { B } & 6 & 16 \
\hline \text { C } & 3 & 19 \
\hline \text { D } & 4 & 10 \
\hline \text { E } & 2 & 9 \
\hline
\end{array}$
Using the earliest due date (EDD) rule, the average lateness for the five jobs is:
A) more than -6 but less than or equal to -2 days.
B) more than -2 but less than or equal to 2 days.
C) more than 2 but less than or equal to 6 days.
D) more than 4 but less than or equal to 8 days.

Question

Five jobs are ready for processing at time zero through a workstation. The details of the processing time and the due date of completion is provided in the following table. 
$\begin{array} { | l | l | l | } 
\hline \text { Job } & \text { Processing Time (days) } & \text { Due Date } \
\hline \text { A } & 5 & 11 \
\hline \text { B } & 6 & 16 \
\hline \text { C } & 3 & 19 \
\hline \text { D } & 4 & 10 \
\hline \text { E } & 2 & 9 \
\hline
\end{array}$
Using the earliest due date (EDD) rule, the average lateness for the five jobs is:
A) more than -6 but less than or equal to -2 days.
B) more than -2 but less than or equal to 2 days.
C) more than 2 but less than or equal to 6 days.
D) more than 4 but less than or equal to 8 days.

Quizplus · Accepted Answer

Using the EDD rule, we prioritize the jobs in the order of their due dates. So, the order of processing the jobs would be: E, D, A, B, C. 
Now, to calculate the lateness, we need to find the completion time for each job and subtract its due date from it. 
For job E, the completion time is 2 days and the due date is 9, so the lateness is 7. 
For job D, the completion time is 6 days and the due date is 10, so the lateness is 4. 
For job A, the completion time is 11 days and the due date is 11, so the lateness is 0. 
For job B, the completion time is 17 days and the due date is 16, so the lateness is -1. 
For job C, the completion time is 23 days and the due date is 19, so the lateness is -4. 
Thus, the average lateness is (-7 + -4 + 0 + -1 + -4)/5 = -16/5 = -3.2
Since -2 < -3.2 ≤ 2, the answer is B.

Five Jobs Are Ready for Processing at Time Zero Through