10.25 Peter Rourke, a loan processor at Wentworth Bank, has been timed performing four work elements, with the results shown in the following table. The allowances for tasks such as this are personal, 7%; fatigue, 10%; and delay, 3%. a) What is the normal

time? b) What is the standard time?

10.29. The Dubuque Cement Company packs 80-pound bags of concrete mix. Time-study data for the filling activity are shown in the following table. Because of the high physical demands of the job, the company’s policy is a

23% allowance for workers. a) Compute the standard time for the bag-packing task. b) How many observations are necessary for 99% confidence, within {5% accuracy?

E.3 If Professor Laurie Macdonald takes 15 minutes to grade the first exam and follows an 80%

learning curve, how long will it take her: a) to grade the 25th exam? b) to grade the first 10 exams?

E.5 Beth Zion Hospital has received initial certification from the state of California to become a center for liver transplants. The hospital, however, must

complete its first 18 transplants under great scrutiny and at no cost to the patients. The very first transplant, just completed, required 30 hours. On the basis of research at the hospital, Beth Zion estimates that it will have an 80% learning curve. Estimate

the time it will take to complete: a) the 5th liver transplant. b) all of the first 5 transplants. c) the 18th transplant. d) all 18 transplants.

E.6 Refer to Problem E.5 (problem above). Beth Zion Hospital has just been informed that only the first 10 transplants

must be performed at the hospital’s expense. The cost per hour of surgery is estimated to be $5,000. Again, the learning rate is 80% and the first surgery took 30 hours. a) How long will the 10th surgery take? b) How much will the 10th surgery cost? c) How

much will all 10 cost the hospital?