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4. The lifetime of a certain brand of laptops has normal distribution with the mean of 6.2 and standard deviation of 3 years. А. If we take a random sample of size 100 laptops of this brand, what is the probability that their sample average lifetime will be between 5 and 9 years. Is the probability you obtain here exact or approximate? Explain. В. What should the manufacturer have as a warranty so that at most 10% of their laptops will need to be serviced or replaced while under warranty?

4. The lifetime of a certain brand of laptops has normal distribution with the mean of 6.2 and standard deviation of 3 years. А. If we take a random sample of size 100 laptops of this brand, what is the probability that their sample average lifetime will be between 5 and 9 years. Is the probability you obtain here exact or approximate? Explain. В. What should the manufacturer have as a warranty so that at most 10% of their laptops will need to be serviced or replaced while under warranty?

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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4. The lifetime of a certain brand of laptops has normal distribution with the mean of 6.2 and standard deviation of 3 years. А. If we take a random sample of size 100 laptops of this brand, what is the probability that their sample average lifetime will be between 5 and 9 years. Is the probability you obtain here exact or approximate? Explain. В. will need to be serviced or replaced while under warranty? What should the manufacturer have as a warranty so that at most 10% of their laptops
Transcribed Image Text:4. The lifetime of a certain brand of laptops has normal distribution with the mean of 6.2 and standard deviation of 3 years. А. If we take a random sample of size 100 laptops of this brand, what is the probability that their sample average lifetime will be between 5 and 9 years. Is the probability you obtain here exact or approximate? Explain. В. will need to be serviced or replaced while under warranty? What should the manufacturer have as a warranty so that at most 10% of their laptops
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