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The lifetime of a certain brand of electric light bulb is known to have a standard deviation of 55 hours Suppose that a random sample

The lifetime of a certain brand of electric light bulb is known to have a standard deviation of 55 hours Suppose that a random sample of 90 bulbs of this brand has a mean lifetime of 493 hours. Find a 90% confidence interval for the true mean lifetime of all light bulbs of this brand. Then give its lower limit and upper limit

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