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6 l5! 6 9 all 52% I 9:28 PM it for grading. Question 15 of 20 : Select the best answer for the question. 15. Assume the mean useful life of a

MAT 106 Business and Finance Basics III and Statistics Question 15 of 20 : Select the best answer for the question. 15.   Assume the mean useful life of a particular light bulb is 2,000 hours, which is normally distributed with a standard deviation of 300 hours. What is the range of the useful life of light bulbs within two standard deviations of the mean?    A. Longer than 1,700 hours    B. Between 1,400 and 2,600 hours    C. Longer than 2,300 hours    D. Between 1,700 and 2,300 hours
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Lower point of the range = mean - 2 x standard deviation = 2000 - 2 x... View the full answer

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