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If a light bulb manufacturing company wants to estimate, with 95% confidence, the mean life of compact fluorescent light bulbs to within {200 hours and

If a light bulb manufacturing company wants to estimate, with 95% confidence, the mean life of compact fluorescent light bulbs to within {200 hours and also assumes that the population standard deviation is 1,000 hours, how many compact fluorescent light bulbs need to be selected?

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