(Solved): Im learning about operating systems and we are on the subject of calculating W(Pi) and turnaround ...

I’m learning about operating systems and we are on the subject of calculating W(Pi) and turnaround time TTrnd(Pi). I have finished SJN and was wondering if someone could confirm if I’ve dont it correctly. I also have started Round Robin with a time quantum of 100 and have to do number 3 as well. This subject is very complicated for me and I could definitely use some help, and show work thank you! (Also a Gantt chart is required for #3 too)