( 2 , 10 , 20 There are two sub-questions in this topic, each sub-question has 10 points, and there are 20 points in total.) 1. Consider the following set of processes, assumed to have arrived at time 0 in the order P1, P2, ,P5 with the length of the CPU burst given in milliseconds Please write the running order of the processes when using priority scheduling, and calculate the average waiting time