The average life of a battery is advertised as 80 hours. A quality control check found that
Question:
The average life of a battery is advertised as 80 hours. A quality control check found that the mean life was normally distributed at 80 hours with a standard deviation of 14 hours.
a. Compute the probability of a mean life between 75 and 90 hours.
b. Compute the probability of a mean life less than 75 hours.
c. Compute the probability of a mean life between 55 and 70 hours.
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a 04017 first find z 036 found by 75 8014 and z 071 found by 90 8014 The area betwe...View the full answer
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Related Book For 
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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