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Mathematics 7 Online
OpenStudy (anonymous):

FOR A GOLD MEDAL! The life of a manufacturer's compact fluorescent light bulbs is normal, with mean 12,000 hours and standard deviation 2,000 hours. Seth wants to find the probability that a light bulb he purchased from this manufacturer will last no more than 14,500 hours. How many standard deviations above the mean is 14,500 hours?

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