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Mathematics 13 Online
OpenStudy (anonymous):

you'll get a fan and a medal for this one :D The lifespan of radios is normally distributed with μ=15.2 years, σ=5 years. Kelly's beloved radio is 25 years old and she is now wondering whether or not it's in the top 5% of the oldest radios today. What would be the lower limit for the oldest 5%?

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