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The Life Expectancy (In Hours) of a Fluorescent Tube Is

Question 29

Multiple Choice

The life expectancy (in hours) of a fluorescent tube is normally distributed with mean 7,000 and standard deviation 1,000. Find the probability that a tube lasts for more than 8,900 hours.


A) 0.9719
B) 0.0287
C) 0.9713
D) 0.0281

Correct Answer:

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