The owner$/$operator of the local franchise of Handyman, Inc., has four jobs to do today, shown in the order they were received:

Job Processing Time $($hrs$)$ Due

$($hrs from now$)$

W $44$

X $35$

Y $22$

Z $11$

If he uses the shortest processing time first priority rule to schedule these jobs, what will be the average number of jobs in his shop today?