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The lifetime of a certain brand of electric lightbulbs is new to the standard deviation of 55 hours suppose the random sample of 90 bulbs

The lifetime of a certain brand of electric lightbulbs is new to the standard deviation of 55 hours suppose the random sample of 90 bulbs of this brand has a mean lifetime of 493 hours find a 95% confidence interval for the true mean lifetime of all bulbs of this brand then give it all lower and upper limits

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