Question Chapter 5 problem 8. The ticket booth on the Tech campus is operated by one person, who is selling tickets for the annual Tech versus State football game on Saturday. The ticket seller c

Chapter 5 problem 8. The ticket booth on the Tech campus is operated by one person, who is selling tickets for the annual Tech versus State football game on Saturday. The ticket seller can serve an average of 12 customers per hour; on average, 10 customers arrive to purchase tickets each hour.

Determine the average time a ticket buyer must wait and the portion of time the ticket seller is busy.

10. The Dynaco Manufacturing Company produces a particular product in an assembly line operation. One of the machines on the line is a drill press that has a single assembly line feeding into it. A partially completed unit arrives at the press to be worked on every 7.5 minutes, on average. The machine operator can process an average of 10 parts per hour. Determine the average number of parts waiting to be worked on, the percentage of time the operator is working, and the percentage of time the machine is idle.

12. The Peachtree Airport in Atlanta serves light aircraft. It has a single runway and one air traffic controller to land planes. It takes an airplane 12 minutes to land and clear the runway. Planes arrive at the airport at the rate of four per hour.

a. Determine the average number of planes that will stack up, waiting to land.
b. Find the average time a plane must wait in line before it can land.

14. During registration at State University every semester, students in the college of business must have their courses approved by the college adviser. It takes the adviser an average of 2 minutes to approve each schedule, and students arrive at the adviser’s office at the rate of 28 per hour.

a. Compute L, Lq, W, Wq, and U.
b. The dean of the college has received a number of complaints from students about the length of time they must wait to have their schedules approved. The dean feels that waiting 10.00 minutes to get a schedule approved is not unreasonable. Each assistant the dean assigns to the advisor’s office will reduce the average time required to approve a schedule by 0.25 minute, down to a minimum time of 1.00 minute to approve a schedule. How many assistants should the dean assign to the adviser?

Chapter 6

problem 2

<pstyle=”margin: 0px=”” 10px;=”” line-height:=”” 1.33em;=”” font-family:=”” ‘helvetica=”” neue’,=”” helvetica,=”” arial,=”” sans-serif;=”” font-size:=”” 14px;=”” color:=”” rgb(17,=”” 17,=”” 17);=”” font-style:=”” normal;=”” font-variant:=”” font-weight:=”” letter-spacing:=”” orphans:=”” auto;=”” text-align:=”” start;=”” text-indent:=”” 0px;=”” text-transform:=”” none;=”” white-space:=”” widows:=”” word-spacing:=”” -webkit-text-stroke-width:=”” background-color:=”” rgb(255,=”” 255,=”” 255);”=””>Hayes Electronics assumes with certainty that the ordering cost is $450 per order and the inventory carrying cost is $170 per unit per year.However, the inventory model parameters are frequently only estimates that are subject to some degree of uncertainty.Consider four cases of variation in the model parameters as follows:(a) both ordering cost and carrying cost are 10% lower than originally estimated.(b) both ordering cost and carrying cost are 10% higher than originally estimated, (c) ordering cost is 10% higher and carrying cost is 10% lower than originally estimated, (d) ordering cost is 10% lower and carrying cost is 10% higher than originally estimated.Determine the optimal order quantity and total inventory cost for each of the four cases.

Prepare a table with values from all four cases and compare the sensitivity of the model solution to changes in parameter values.

problem 4

<pstyle=”margin: 0px=”” 10px;=”” line-height:=”” 1.33em;=”” font-family:=”” ‘helvetica=”” neue’,=”” helvetica,=”” arial,=”” sans-serif;=”” font-size:=”” 14px;=”” color:=”” rgb(17,=”” 17,=”” 17);=”” font-style:=”” normal;=”” font-variant:=”” font-weight:=”” letter-spacing:=”” orphans:=”” auto;=”” text-align:=”” start;=”” text-indent:=”” 0px;=”” text-transform:=”” none;=”” white-space:=”” widows:=”” word-spacing:=”” -webkit-text-stroke-width:=”” background-color:=”” rgb(255,=”” 255,=”” 255);”=””>The Western Jeans Company purchases denim from Cumberland Textile Mills. The Western Jeans Company uses 235,000 yards of denim per year to make jeans. The cost of ordering denim from the textile company is $250 per order. It costs Western $1.65 per yard annually to hold a yard of denim in inventory. Determine the optimal number of yards of denim the Western Jeans Company should order, the minimum total annual inventory cost, the optimal number of orders per year, and the optimal time between orders.If possible, use Excel 3M or QM for Windows.

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