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? PX
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? PX
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. 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? PX
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