Posted by alice on Wednesday, December 5, 2012 at 1:36pm.
This is from the actual problem - A consumer product testing lab tested 400 13-watt compact
fluorescent light bulbs by turning them all on at once, leaving them
on until they burned out, and recording the time-to-failure of each
bulb. The test revealed a symmetric and mound-shaped
distribution of times-to-failure with mean 7800 hours and standard
deviation 1200 hours. The number of lightbulbs that lasted between 5400 and 9000 hours were about 326 lightbulbs.
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