The Bell company manufactures laptop computers. A study indicates that the life spans of their computers are normally distributed, with a mean of 4.0 years and a standard deviation of 1.2 years. How long should the company warrant its computers if the company wishes less than 4% of its computers to fail during the warranty period?
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This is because we want to find the time at which less than 4% of the computers fail, which means we are looking for the time at which 96% of the computers are still functioning. The z-score that corresponds to the top 4% of a normal distribution is approximately Show moreā¦
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