1. Our classroom (MNT 203) is lit partially by fluorescent tubes, each of which fails, on average, after 4000 hours of operation. Since it is costly to have a technician in place toreplace tubes whenever they fail, the management decided to check them for replacementafter 3000 hours. Assuming that we have 300 fluorescent tubes in MNT 203: a. What is the probability that the first tube fails before 1000 hours? b. On average, how many failed tubes will be replaced on 3000 hours replacement check?

1. Our classroom (MNT 203) is lit partially by fluorescent tubes, each of which fails, on average, after 4000 hours of operation. Since it is costly to have a technician in place toreplace tubes whenever they fail, the management decided to check them for replacementafter 3000 hours. Assuming that we have 300 fluorescent tubes in MNT 203: a. What is the probability that the first tube fails before 1000 hours? b. On average, how many failed tubes will be replaced on 3000 hours replacement check?

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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Question

1. Our classroom (MNT 203) is lit partially by fluorescent tubes, each of which fails, on
average, after 4000 hours of operation. Since it is costly to have a technician in place toreplace tubes whenever they fail, the management decided to check them for replacementafter 3000 hours. Assuming that we have 300 fluorescent tubes in MNT 203:
a. What is the probability that the first tube fails before 1000 hours?

b. On average, how many failed tubes will be replaced on 3000 hours replacement
check?

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