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22 July, 18:25

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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  1. 22 July, 18:55
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    0 lightbulbs would be expected to burn out in 1800 hours
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