A manufacturing plant utilizes 3000 electric light bulbs whose length of life is
Chapter 4, Problem 4.162(choose chapter or problem)
A manufacturing plant utilizes 3000 electric light bulbs whose length of life is normally distributed with mean 500 hours and standard deviation 50 hours. To minimize the number of bulbs that burn out during operating hours, all the bulbs are replaced after a given period of operation. How often should the bulbs be replaced if we want not more than 1% of the bulbs to burn out between replacement periods?
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