Solution

The correct answer is 16

EXPLANATION:

Gantt chart:

\(\text{Waiting Time} = \text{Completion Time} - \text{Arrival Time}\)

\(\text{Average Waiting Time} = \frac{\text{Sum of All Waiting Times}}{\text{Number of Processes}} \)

\(\text{Average Waiting Time} = \frac{\text{0 + 8 + 23 + 33}}{\text{4}} \)

\(\text{Average Waiting Time} = \frac{\text{64}}{\text{4}} \)

\(\text{Average Waiting Time} = 16\)