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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 110000 hours squared. Experimental testing of 59 light bulbs yielded an average lifetime of 19.3 hundred hours. Based on this evidence, construct a 92% confidence interval for the average lifetime of the bulbs produced in Osmar's Melbourne plant. Report only the upper limit of this interval in hours to one decimal place.

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