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(4)If the company gives a money back guarantee that their light bulb lasts a certain amount of time, and it does not want to give
(4)If the company gives a money back guarantee that their light bulb lasts a certain amount of time, and it does not want to give more that 5% (.05) of customers their money back. What is the smallest lifetime they should advertise for their bulb to the nearest 10 hours?
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