The life in hours of a 75-watt light bulb is known to be normally distributed with o = 24 hours. A random sample of 20 bulbs has a meal life of 1012 hours. Suppose that we wanted the total width of the two-sided confidence interval on mean life to be six hours at 95% confidence. What sample size should be used? Round up the answer to the nearest integer. i Statistical Tables and Chart

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