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A Chinese company manufactures 18 watt LED luminaires. according to the specifications written in the box,...

A Chinese company manufactures 18 watt LED luminaires. according to the specifications written in the box, you have an average life of 9000 hours with a standard deviation of 500 hours, suppose that the distribution is symmetric around the average.
Estimate what percentage of the luminaries will not last at least 700 hours

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