A manufacturer of light bulbs claims that its light bulbs have a mean life of 700 hours

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A manufacturer of light bulbs claims that its light bulbs have a mean life of 700 hours and a standard deviation of 120 hours. You purchased 144 of these bulbs and decided that you would purchase more if the mean life of your current sample exceeds 680 hours. What is the probability that you will not buy again from this manufacturer?
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Elementary Statistics

ISBN: 9780538733502

11th Edition

Authors: Robert R. Johnson, Patricia J. Kuby

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