Supposed that the lifetimes of a certain kind of light bulb are…

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Question Answered step-by-step Supposed that the lifetimes of a certain kind of light bulb are… Supposed that the lifetimes of a certain kind of light bulb are normally distributed with a standard deviation of 120 hours. If exactly 99% of the light bulbs die before 905 hours find the mean lifetime of the bulbs Math Statistics and Probability MATH 2058 Share QuestionEmailCopy link Comments (0)