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1000 light bulbs with a mean life of 120 days are installed in new factory their length of life is normally distributed with standard deviation

1000 light bulbs with a mean life of 120 days are installed in new factory their length of life is normally distributed with standard deviation 20 days. how mau bulbs will expire in less then 90 days? if it is decided to replace all the bulbs together what intervals should be allowed between replacements if not more then 10 percent should expire before replacement give solution

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