What Is the Average Lateness of These Seven Jobs If

Multiple Choice

What is the average lateness of these seven jobs if they are scheduled using the critical ratio criterion? $$\begin{array} { | c | c | c | } \hline \text { Job } & \text { Process Time } & \text { Due Date } \\\hline \text { Job 1 } & 15 & 23 \\\hline \text { Job 2 } & 7 & 15 \\\hline \text { Job 3 } & 12 & 34 \\\hline \text { Job 4 } & 8 & 16 \\\hline \text { Job 5 } & 11 & 27 \\\hline \text { Job 6 } & 10 & 19 \\\hline \text { Job 7 } & 13 & 28 \\\hline\end{array}$$

A) 24.3
B) 21.7
C) 22.5
D) 23.4