$$a$)$ Using the FCFS$($first come, first served$)$ decision rule for sequencing the$$ jobs, the order is$($assume that jobs came in the order in which they are listed in the$$ table$)$:

Part $2$Part $3$Part $4$Part $5$

Sequence

Job

$1$

A

$2$

B

$3$

C

$4$

D

$5$

E

Part $6$

The average tardiness$($job lateness$)$ for the sequence developed using the FCFS rule$=$

$$

$26\mathrm{.}80$ days $($round your response to two decimal$$ places$).$