Question: What percent of the tires will last between 85,000 km and 100,000 km? The lifetimes of a certain type of automobile tire have been found

What percent of the tires will last between 85,000 km and 100,000 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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