Question: The following Gantt chart shows the CPU burst times (in milliseconds) of three processes using the round robin scheduling algorithm:

P1

P2

P3

P1

P1

P1

0 5 8 12 17 22 26

Suppose the three processes, P1, P2 and P3, all arrive at time 0 and we are using a time quantum of 5 milliseconds. Assuming we are not including time for performing context switching, what is the average waiting time in the above example? (choose one of the following):

A)	8.67 milliseconds
B)	26 milliseconds
C)	7.67 milliseconds
D)	5.67 milliseconds
E)	6.67 milliseconds