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The QuickStart Battery Company, sells batteries that have a normally distributed lifetime with a standard deviation of 7 months. An observational study of a random

The QuickStart Battery Company, sells batteries that have a normally distributed lifetime with a standard deviation of 7 months. An observational study of a random sample of 42 batteries found the mean lifetime was 52.4 months. Estimate the average lifetime of the overall population of batteries with a margin of error at 95% confidence level, and to the nearest tenth of a month.

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