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A manufacturing plant utilizes electric light bulbs whose length of life is normally distributed with mean hours and standard deviation 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 of the bulbs to burn out between replacement periods?
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A manufacturing plant utilizes electric light bulbs whose length of life is normally distributed wit...
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