(a) Find a bound on the probability that one of these Christmas tree lights will require replacement between 200 hr and 220 hr. at least 100 % (b) Suppose a large city uses 140,000 of these Christmas tree lights as part of its Christmas decorations. Estimate the number of lights that are likely to require replacement between 190 hr an 230 hr of use. lights
(a) Find a bound on the probability that one of these Christmas tree lights will require replacement between 200 hr and 220 hr. at least 100 % (b) Suppose a large city uses 140,000 of these Christmas tree lights as part of its Christmas decorations. Estimate the number of lights that are likely to require replacement between 190 hr an 230 hr of use. lights
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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![A Christmas
tree light has an expected life of 210 hr and a standard deviation of 2 hr.
(a) Find a bound on the probability that one of these Christmas tree lights will require replacement between 200 hr and 220 hr.
at least 100
%
(b) Suppose a large city uses 140,000 of these Christmas tree lights as part of its Christmas decorations. Estimate the number of lights that are likely to require replacement between 190 hr and
230 hr of use.
lights](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F61579da3-25fa-4998-ac13-5ead12d6c1b5%2F59912941-f558-48c1-b2af-3a1fed3ece74%2Fojiuer8_processed.jpeg&w=3840&q=75)
Transcribed Image Text:A Christmas
tree light has an expected life of 210 hr and a standard deviation of 2 hr.
(a) Find a bound on the probability that one of these Christmas tree lights will require replacement between 200 hr and 220 hr.
at least 100
%
(b) Suppose a large city uses 140,000 of these Christmas tree lights as part of its Christmas decorations. Estimate the number of lights that are likely to require replacement between 190 hr and
230 hr of use.
lights
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