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if the life in years of a washing machine is normally distributed with a mean of 15 years and a standard deviation of 1.6 years what should be the guarantee period if the company wants less than 1% of the machines to fail while under warranty
8 years ago

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Steve
take a look here, and you can play with your numbers:

http://davidmlane.com/hyperstat/z_table.html
8 years ago

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