(OPERATING SYSTEMS) especially C section most important one, watch out a has given values, thx

(\%30) Consider the following set of jobs to be scheduled for execution on a single CPU system (a) Draw a Gantt chart showing preemptive SRJF scheduling. (b) Calculate and show the average waiting time and turnaround time. (c) Now assume that, process P3 used the CPU for (10ms,4ms,11ms) in its 3 previous executions. What will be the next CPU burst prediction for P3 if the system uses exponential averaging with =0.6 for most recent past and =0.4 for the earlier cpu usages