The average life of a lightbulb is 2500 h, with a standard deviation of 200 h. Suppose that 10,000 bulbs are purchased to equip a new building. Assume that the lives are normally distributed. How many of the light bulbs would be expected to burn out after just 1800 h?
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Home » Mathematics » The average life of a lightbulb is 2500 h, with a standard deviation of 200 h. Suppose that 10,000 bulbs are purchased to equip a new building. Assume that the lives are normally distributed.