The Average Number of Jobs in the Work Center for the Jobs

Multiple Choice

The average number of jobs in the work center for the jobs listed in the following table under the FCFS (first come,first served) rule is ______. $$\begin{array} { | c | c | c | } \hline \text { Job } & \begin{array} { c } \text { Processing time } \\\text { (in days\} }\end{array} & \begin{array} { c } \text { Due date (in days from } \\\text { today's date\} }\end{array} \\\hline \text { A } & 4 & 9 \\\hline \text { B } & 10 & 18 \\\hline \text { C } & 6 & 6 \\\hline \text { D } & 12 & 19 \\\hline \text { E } & 7 & 17 \\\hline\end{array}$$

A) 3.5
B) 2.1
C) 3.23
D) 2.79