SCENARIO In the process shown below, there are three different streams of customers arriving at workstation A. Regardless of the source of customers, upon arrival the customers wait for workstation A. On average 2 customers per minute arrive from source 1. On average 0.5 customers per minute arrive from source 2. On average 1.5 customers per minute arrive from source 3. After workstation A, 60% of the customers go to workstation B. 30% go to workstation C. 10% go to workstation D. All flow units going to activities B & C exit at completion, but flow units leaving D go to C before exiting. On average there are 11.5 customers waiting at A, and activity A takes 8.25 minutes On average there are 2 customers waiting at B, and activity B takes 6 minutes On average there are 0.5 customers waiting at C, and activity C takes 3 minutes On average there are 3.5 customers waiting at D and activity D takes 7.5 minutes B B Source 1 I= R= cust/min R= T= Where ? A A Source 2 R= cust/min I= R= TE EXIT R cust/min R= T= Source 3 D D I= R= T= 11 4 What is the theoretical flow time for customers who do process B? 12 4 What is the average flow time of customers who go to service D? 13 6 What is the average flow time of all customers exiting this process? 14 5 What is the average number of customers in this system? SCENARIO In the process shown below, there are three different streams of customers arriving at workstation A. Regardless of the source of customers, upon arrival the customers wait for workstation A. On average 2 customers per minute arrive from source 1. On average 0.5 customers per minute arrive from source 2. On average 1.5 customers per minute arrive from source 3. After workstation A, 60% of the customers go to workstation B. 30% go to workstation C. 10% go to workstation D. All flow units going to activities B & C exit at completion, but flow units leaving D go to C before exiting. On average there are 11.5 customers waiting at A, and activity A takes 8.25 minutes On average there are 2 customers waiting at B, and activity B takes 6 minutes On average there are 0.5 customers waiting at C, and activity C takes 3 minutes On average there are 3.5 customers waiting at D and activity D takes 7.5 minutes B B Source 1 I= R= cust/min R= T= Where ? A A Source 2 R= cust/min I= R= TE EXIT R cust/min R= T= Source 3 D D I= R= T= 11 4 What is the theoretical flow time for customers who do process B? 12 4 What is the average flow time of customers who go to service D? 13 6 What is the average flow time of all customers exiting this process? 14 5 What is the average number of customers in this system