Rick Wing, salesperson for Wave Soldering Systems, Inc. (WSSI), has provided you with a proposa for improving the temperature control on your present machine. The machine uses a hot-air knife to cleanly remove excess solder from printed circuit boards; this is a great concept, but the hot-air temperature control lacks reliability. According to Wing, engineers at WSSI have improved the reliability of the critical temperature controls. The new system still has the four sensitive integrated circuits controlling the temperature, but the new machine has a backup for each. The four integrated circuits have reliabilities of 0.87, 0.89, 0.91, and 0.93. The four backup circuits all have a reliability o 0.87. a) The overall reliability of the new temperature controller = 94.89 % (enter your response as a percentage rounded to two decimal places). b) If you pay a premium, Wing says he can improve all four of the backup units to 0.90. The overall reliability of the new temperature controller with the upgraded backup unit =% (enter your response as a percentage rounded to two decimal places).

Practical Management Science
6th Edition
ISBN:9781337406659
Author:WINSTON, Wayne L.
Publisher:WINSTON, Wayne L.
Chapter2: Introduction To Spreadsheet Modeling
Section: Chapter Questions
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I got the first part correct on my study guide, but I need some assistance on question 2 :)

Rick Wing, salesperson for Wave Soldering Systems, Inc. (WSSI), has provided you with a proposal
for improving the temperature control on your present machine. The machine uses a hot-air knife to
cleanly remove excess solder from printed circuit boards; this is a great concept, but the hot-air
temperature control lacks reliability. According to Wing, engineers at WSSI have improved the
reliability of the critical temperature controls. The new system still has the four sensitive integrated
circuits controlling the temperature, but the new machine has a backup for each. The four integrated
circuits have reliabilities of 0.87, 0.89, 0.91, and 0.93. The four backup circuits all have a reliability of
0.87.
a) The overall reliability of the new temperature controller = 94.89 % (enter your response as a
percentage rounded to two decimal places).
b) If you pay a premium, Wing says he can improve all four of the backup units to 0.90. The overall
reliability of the new temperature controller with the upgraded backup unit =% (enter your
response as a percentage rounded to two decimal places).
Transcribed Image Text:Rick Wing, salesperson for Wave Soldering Systems, Inc. (WSSI), has provided you with a proposal for improving the temperature control on your present machine. The machine uses a hot-air knife to cleanly remove excess solder from printed circuit boards; this is a great concept, but the hot-air temperature control lacks reliability. According to Wing, engineers at WSSI have improved the reliability of the critical temperature controls. The new system still has the four sensitive integrated circuits controlling the temperature, but the new machine has a backup for each. The four integrated circuits have reliabilities of 0.87, 0.89, 0.91, and 0.93. The four backup circuits all have a reliability of 0.87. a) The overall reliability of the new temperature controller = 94.89 % (enter your response as a percentage rounded to two decimal places). b) If you pay a premium, Wing says he can improve all four of the backup units to 0.90. The overall reliability of the new temperature controller with the upgraded backup unit =% (enter your response as a percentage rounded to two decimal places).
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