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17-07-2024
Mathematics

Answered

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?

1.25

1.5

2.5

Answer :

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