A manufacturer of automobile batteries claims that the average length of life for its grade A battery

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A manufacturer of automobile batteries claims that the average length of life for its grade A battery is 60 months. However, the guarantee on this brand is for just 36 months. Suppose the standard deviation of the life length is known to be 10 months, and the frequency distribution of the life-length data is known to be mound-shaped.

a. Approximately what percentage of the manufacturer’s grade A batteries will last more than 50 months, assuming the manufacturer’s claim is true?

b. Approximately what percentage of the manufacturer’s batteries will last less than 40 months, assuming the manufacturer’s claim is true?

c. Suppose your battery lasts 37 months. What could you infer about the manufacturer’s claim?

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If the distribution of life length is assumed to be moundshaped with a mean of 60 months and a standard deviation of 10 months it would appear as show...View the full answer

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Statistics For Business And Economics

ISBN: 9781292227085

13th Global Edition

Authors: Terry Sincich James Mcclave, P. George Benson

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Question Posted: Dec 12, 2023 04:41 AM

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A manufacturer of automobile batteries claims that the average length of life for its grade A battery

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If the distribution of life length is assumed to be moundshaped with a mean of 60 months and a standard deviation of 10 months it would appear as show...View the full answer

Statistics For Business And Economics

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