The lifetimes of light bulbs of a particular type are normally

Question 1 of 20 5.0 PointsThe lifetimes of light bulbs of a particular type are normally distributed with a mean of 270 hours and a standard deviation of 11 hours. What percentage of the bulbs has lifetimes that lie within 2 standard deviations of the mean on either side?Apply the 68-95-99.7 rule to this questions. […]

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