SOLUTION: The Bell company manufactures laptop computers. A study indicates that the life spans of their computers are normally distributed, with a mean of 4 years and a standard deviation o

Question 1188741: The Bell company manufactures laptop computers. A study indicates that the life spans of their computers are normally distributed, with a mean of 4 years and a standard deviation of 1 year. How long should the company warrant its computers if the company wishes less than 2.28% of its computers to fail during the warranty period?
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
2.28% is at the left side of the curve and is 2 sd away from the mean.
z=-2=(x-4)/1
x=2 years
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