=+7.50 The light bulbs used to provide exterior lighting for a large office building have an average
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=+7.50 The light bulbs used to provide exterior lighting for a large office building have an average lifetime of 700 hr. If the distribution of the variable x 5 length of bulb life can be modeled as a normal distribution with a standard deviation of 50 hr, how often should all the bulbs be replaced so that only 20% of the bulbs will have already burned out?
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Related Book For 
Statistics The Exploration And Analysis Of Data
ISBN: 9781111804138
6th Edition
Authors: John M Scheb, Jay Devore, Roxy Peck
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