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he local authorities in a certain city instal 10,000 electric lamps in the treets of the city. If these lamps have an average life of 1,000 burning ours with a standard deviation of 200 h, how many lamps might be xpected to fail (i) in the first 800 burning hours? (ii) between 800 and 200 burning hours? After how many burning hours would you expect ii) 10% of the lamps to fail? (iv) 10% of the lamps to be still burning? Assume that the life of lamps is normally distributed.

he local authorities in a certain city instal 10,000 electric lamps in the treets of the city. If these lamps have an average life of 1,000 burning ours with a standard deviation of 200 h, how many lamps might be xpected to fail (i) in the first 800 burning hours? (ii) between 800 and 200 burning hours? After how many burning hours would you expect ii) 10% of the lamps to fail? (iv) 10% of the lamps to be still burning? Assume that the life of lamps is normally distributed.

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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The local authorities in a certain city instal 10,000 electric lamps in the streets of the city. If these lamps have an average life of 1,000 burning hours with a standard deviation of 200 h, how many lamps might be expected to fail (i) in the first 800 burning hours? (ii) between 800 and 1200 burning hours? After how many burning hours would you expect (iii) 10% of the lamps to fail? (iv) 10% of the lamps to be still burning? Assume that the life of lamps is normally distributed.
Transcribed Image Text:The local authorities in a certain city instal 10,000 electric lamps in the streets of the city. If these lamps have an average life of 1,000 burning hours with a standard deviation of 200 h, how many lamps might be expected to fail (i) in the first 800 burning hours? (ii) between 800 and 1200 burning hours? After how many burning hours would you expect (iii) 10% of the lamps to fail? (iv) 10% of the lamps to be still burning? Assume that the life of lamps is normally distributed.
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