The life span of a new flameless candle from a certain company is normally distributed. The mean life is 300 hours with a standa
rd 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
