A new extended-life light bulb has an average service life of750 hours, with a s

Question

A new extended-life light bulb has an average service life of750 hours, with a standard deviation of 50 hours. If theservice life of these light bulbs approximates a normaldistribution, about what percent of the distribution will bebetween 600 hours and 900 hours? Which is the correct answer? A. 95% B. 68% C. 34% D. 99.7% A new extended-life light bulb has an average service life of750 hours, with a standard deviation of 50 hours. If theservice life of these light bulbs approximates a normaldistribution, about what percent of the distribution will bebetween 600 hours and 900 hours? Which is the correct answer? A. 95% B. 68% C. 34% D. 99.7%

Explanation / Answer

600 is 3 standard deviations below the mean and 900 is 3 SDs abovethe mean, so the answer is 99.7% (D) by the Empirical Rule

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