Mathematics, 01.09.2019 09:20 aj2869

Suppose compact fluorescent light bulbs last, on average, 10,000 hours. the standard deviation is 500 hours. what percent of light bulbs burn out within 11,000 hours?
how do you show your work for this problem. i dont know how to solve it.

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Suppose compact fluorescent light bulbs last, on average, 10,000 hours. the standard deviation is 50...