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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

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Wyleen

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

    http://davidmlane.com/hyperstat/z_table.html

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    Steve

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