The average life of a battery is advertised at 80 hours. A quality control check found that

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The average life of a battery is advertised at 80 hours. A quality control check found that the mean life was normally distributed at 80 hours, with a standard deviation of 14 hours. Determine the value above which 80% of the values will occur.

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Basic Statistics For Business & Economics

ISBN: 9781259268939

6th Canadian Edition

Authors: Douglas A. Lind, William G Marchal, Samuel A. Wathen, Carol Ann Waite

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