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A random sample of 39 lithium batteries has a mean lifetime of 545 hours with a standard deviation of 40 hours. The 90% confidence interval for u, the mean lifetime of all lithium batteries is: Use the tables and flow charts in the provided Formula & Tables packet. Enter your answer to one decimal place.

A random sample of 39 lithium batteries has a mean lifetime of 545 hours with a standard deviation of 40 hours. The $90%$ confidence interval for $μ$, the mean lifetime of all lithium batteries is: Use the tables and flow charts in the provided Formula \& Tables packet 3 . Enter your answer to one decimal place.

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