A dusk-to-dawn outdoor light bulb has an expected (mean) life of 8,000 hours with a standard deviation

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A dusk-to-dawn outdoor light bulb has an expected (mean) life of 8,000 hours with a standard deviation of 250 hours. How many bulbs in a batch of 500 can be expected to last no longer than 7,500 hours?

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Business Math

ISBN: 978-0133011203

10th edition

Authors: Cheryl Cleaves, Margie Hobbs, Jeffrey Noble

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Question Posted: Mar 11, 2016 01:36 AM

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A dusk-to-dawn outdoor light bulb has an expected (mean) life of 8,000 hours with a standard deviation

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7500 hours is 500 hours below the mean 8000 7500 500 hours 500 hours is 2 s...View the full answer

Business Math

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