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A manufacturer of automobile batteries claims that the average length of life for its grade A battery is 60 months. Suppose the standard deviation of the life length is known to be 10 months.

a) Approximately what percentage of the manufacturer's batteries will last between 40 months and 80 months?

b) suppose your battery lasts 37 months. What could you infer about the manufacturer's claim?

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Statistics and Probability, Statistics

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