Question: In a large industrial complex, the maintenance department has been instructed to replace light bulbs before they burn out. It is known that the life

In a large industrial complex, the maintenance department has been instructed to replace light bulbs before they burn out. It is known that the life of light bulbs is normally distributed with a mean life of 900 hours of use and a standard deviation of 75 hours. When should the light bulbs be replaced so that no more than 10% of them burn out while in use?

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