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Mathematics, 06.06.2020 19:00 victorialeona81

The lifetime of 20,000 light bulbs are normally distributed. The mean lifetime is 230 days. The standard deviation is 40 days. Find the defined by the standard deviation in a normal distribution for 3 standard deviations. A) 230 to 310
B) 150 to 310
C) 110 to 350
D) 230 to 350

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