Scheduling with FCFS$($First$-$Come First$-$Served$),$ SJF $($Shortest$-$Job$-$First$),$ and SRT $($Shortest$-$remaining$-$time$-$first$).$

Staring at time $0,$ a new process p of length $3$ arrives every $4$ time units.

Staring at time $1,$ a new process q of length $1$ arrives every $4$ time units.

Determine the average waiting time under FCFS$,$ SJF$,$ and SRT$.$

What is the average waiting time for the two processes p and q under SRT$?$