Consider a batch system with two disks. Each job makes 20 visits to disk B and 4 visits to disk A. The service times per visit to the CPU, disk B, and disk A are 40, 30, and 25 milliseconds. The degree of multiprogramming is 3. Determine the distribution of the CPU queue length. Also, find the system throughput varying the degree of multiprogramming from 1 to 3.