$$ Using Shortest $-$remaining$-$time$-$first study the below about Process Information:

After that try to:

Draw the SJF Gantt Chart.

Calculate the average for all processes.

$\backslash$table$[[$Process$,$Arrival Time,Burst time$],[$A$,0,7],[$B$,2,4],[$C$,4,1],[$D$,5,4]]$