Three processes with process IDs P1, P2, P3 with estimated completion time 
6, 2, 4 milliseconds respectively, enters the ready queue together in the order 
P1, P3, P2. Process P4 with estimated execution time 4 milliseconds entered 
the ready queue 3 milliseconds later the start of execution of P1. Calculate the 
waiting time and Turn Around Time (TAT) for each process and the Average 
waiting time and Turn Around Time (Assuming there is no I/O waiting for 
the processes) in RR algorithm with Time slice = 2 ms.