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Osmar Ltd conducted a study to determine the lifetimes of the light bulbs produced by their...

Osmar Ltd conducted a study to determine the lifetimes of the light bulbs produced by their Melbourne plant. Based on studies in other plants, it could be assumed that the variance of the lifetimes was 130000 hours squared. Experimental testing of 49 light bulbs yielded an average lifetime of 24 hundred hours. Construct a 90% confidence interval for the average lifetime of the bulbs produced in Osmar's Melbourne plant. Report the lower limit in hours to 1 decimal place.

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