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Only OTA 103997

Only above listed OTA
Replacement time for tv sets normally distributed with a mean of 8.2 years and a stan. dev. of 1.1 years. a) Find probability that a randomly selected set will have a replacement time less than 5.0 years
b) If you want to provide a warranty so that only 1% of the sets will be replaced before the warranty expires, what is the time length of the warranty?

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