1. Homework #9
1. A reclamation center produces two products, A and B. The sales volume for produce A is at least 60 % of the total sales of the two products. Both products use the same raw material, of which the daily availability is limited to 100 lb. Products A and B use this raw material at the rates of 2 lb/unit and 4 lb/unit, respectively. The sales price for the two products are $20 and $40 per unit. Formulate the problem as a linear programming problem.

2. Homework #9
2. For the data given in the last problem of midterm exam, reproduced in slide # 14 of class 26, does the actual observation lie within:
i) 68 % probability interval on the observation?
ii) 90 % probability interval on the observation?
iii) 99 % probability interval on the observation?
3. Use slide 24 of class 8 (3/22/00) to write down a model for the feedback loop of X2t as the output and X4t as the input.

4. Homework #9
4. For the auto-focus unit reliability example of class 27, determine the component MTTF if the number of components is reduced to 5. What will the component reliability be after 2000 hours of operation?
(Answer: MTTFc:194,957 h; Rc= )