5.14 For the normal distribution of burning times of electric light bulbs, with a mean equal to...
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5.14 For the normal distribution of burning times of electric light bulbs, with a mean equal to 1200 hours and a standard deviation equal to 120 hours, what burning time is identified with the (a) upper 50 percent? (b) lower 75 percent? (c) lower 1 percent? (d) middle 90 percent?
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ISBN: 978-0324375589
6th Edition
Authors: larry e. rittenberg, bradley j. schwieger, karla m. johnston
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