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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 225 hours and

If a light bulb manufacturing company wants to estimate, with 95% confidence, the mean life of compact fluorescent light bulbs to within 225 hours and also assumes that the population standard deviation is 1000 hours, how many compact fluorescent light bulbs need to be selected?

N= (Round up to the nearest integer)

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