Question: If the manufacturer guarantees to replace all tires that do not last 75,000 km, what percent of the tires may have to be replaced under

If the manufacturer guarantees to replace all tires that do not last 75,000 km, what percent of the tires may have to be replaced under this guarantee?


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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