In a sample of 5000 of these tires, how many can be expected to last more than

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In a sample of 5000 of these tires, how many can be expected to last more than 118,000 km?


The lifetimes of a certain type of automobile tire have been found to be distributed normally with a mean lifetime of 100,000 km and a standard deviation of 10,000 km. 

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Basic Technical Mathematics

ISBN: 9780137529896

12th Edition

Authors: Allyn J. Washington, Richard Evans

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