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The lifetime of a certain brand of electric light bulb is known to have a standard deviation of50 hours. Suppose that a random sample of80

The lifetime of a certain brand of electric light bulb is known to have a standard deviation of50

hours. Suppose that a random sample of80

bulbs of this brand has a mean lifetime of475

hours. Find a99

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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