# Lot 2000 Safety 500 Need 200 Min Per Week

1. Prepare a master production schedule (MPS) chart using the following information. Weekly Demand (weeks 1 thru 6): 810; 1350; 1100; 1000; 610; 1300. Minimum Lot Size = 2000; Safety Stock = 500; Beginning Inventory = 1000.

Inv 1000 weeks 1 2 3 4 5 6

810 1350 1100 610 1300

Lot 2000 safety 500 need 200 min per week

1. A college bookstore opens a booth and buys back used books during final exam week. From 9 to 12 in the morning students arrive at the rate of 40 per hour. The bookstore employee can service 50 students per hour. What is the average time in minutes that a student will be in the bookstore (system)?
1. Project path A-C-E-J has these activity time estimates in days:

ActivityOptimisticMost LikelyPessimistic

A 3 4 5

C 9 12 14

E 12 15 20

J 7 9 9

Compute the expected time or duration for each activity, the variance for each activity, and the expected duration and variance for the path.

1. A pipe company sells plastic pipe to water companies. Historic demand for the past 40 weeks is shown below:

SalesWeeks

5K – 10K 4

11K – 20K 12

21K – 30K 16

31K – 40K 8

If the company wanted to do a Monte Carlo simulation analysis, what would the random number assignments to the sales classes be?

4 classes 50 % distribution 89.3% in the 23---78 percentile

1. What 7 steps should a company plan for in order to successfully convert to a JIT system?
1. Two separate operations are required to complete a product. Use Johnson's rule to sequence the following six jobs using the given times.

JobOperation 1Operation 2

A 1.6 hrs. 1.9 hrs.

B 1.3 1.1

C 1.5 1.7

D 1.6 1.4

E 1.5 1.2

F 2.0 1.6

Job sequenced 1.3

1.4total 1.2345 hrs a c b e d f

1. Draw a Gantt chart that shows how the following five classes can be scheduled into two classrooms, A and B: Business Development from 9 AM to 11:45 AM; Market Research from 2 PM to 4:45 PM; Operations Management from 8 AM to 10:45 AM; Case Problems from Noon to 2:45 PM; and Managerial Finance from 11 AM to 1:45 PM. Leave a 15 minute period between classes for students to come and go.

15 min difference A/b dev c/d e/f fin market research 2;45

1. What is the difference between repair and preventive maintenance?
1. An airline has 20 planes, is short on money, and doesn't want to spend any more than necessary to keep the planes safely flying. The cost to perform preventive maintenance (PM) on all 20 planes is \$16,000. If a plane has a malfunction between PM inspections, it costs an average of \$4000 to fix it. The malfunction history on the planes is as follows:

Months between PMProbability of malfunction

One.2

Two.3

Three.5

How often should PM occur to minimize the total expected costs?

1. You need the following to produce Product A: 1 B per A; 1 C per A; 1 D per B; 1 E per B; 2 F per C; 1 G per C, and 2 E per G. If you have the following on hand, how many more of each would you have to produce to have 120 A? On hand: 30 A; 10 B; 50 C; 50 D; 125 E; 0 F; and 30 G.