Given:
Jack's transportation expenditures for three months were $56.08, $91.60, $74.
To find the average monthly expense for transportation:
The average is,
[tex]\begin{gathered} \frac{56.08+91.60+74}{3}=\frac{221.68}{3} \\ =73.89 \end{gathered}[/tex]Hence, the average monthly expense for transportation is $73.89.