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The mean life of a tire is 30,000 km. The standard deviation is 2000 km.


Then, 68% of all tires will have a life between ___________ km and __________ km.

 28,000 km and 32,000 km.

24,000 km and 34,000 km.

26,000 km and 34,000 km.

27,000 km and 31,000 km.

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