10. (4 marks) Three jobs run concurrently under a multiprogramming OS with a single processor. Job duration times, as well as a memory utilization histogram, are indicated below. Use this information to answer questions a) and b) for the concurrent execution of these 3 jobs: Memory - 100% a) What is the Memory usage (in percent)? Show your work. - 50% 0% 0 - 8 12 16 4 minutes Durations Job1 Job2 Job3 b) What is the mean response time (in minutes)? Show your work. 8 12 16 0 4 minutes