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Auto batteries have an average life of 2 . 7 years. Battery life is normally distributed with a mean of 2 . 7 years and
Auto batteries have an average life of years. Battery life is normally distributed with a mean of years and a standard deviation of years. The batteries are warranted to operate for a minimum of years. If a battery fails within the warranty period, it will be replaced with a new battery at no charge. The company sells and installs the batteries. Also, the usual $ installation charge will be waived.
Use and Table B
a What percentage of batteries would you expect to fail before the warranty period expires? Round your z value to decimal places. Round probabilities to decimal places. Round your final answer to decimal places.
b A competitor is offering a warranty of months on its premium battery. The manager of this company is toying with the idea of using the same battery with a different exterior, labeling it as a premium battery, and offering a month warranty on it What percentage of the batteries would you expect to fail before this new warranty period expires? Round your z value to decimal places. Round probabilities to decimal places. Round your final answer to decimal places.
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