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Mathematics, 10.07.2019 18:00 josephmarvens1666

The life span of a new flameless candle from a certain company is normally distributed. the mean life is 300 hours with a standard deviation of 40 hours. find a range of candle life span which lies within 2 standard deviation, about 95%. between 180 and 340 hours between 260 and 340 hours between 180 and 420 hours between 220 and 380 hours

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