Posted by **Carlos** on Tuesday, October 9, 2012 at 10:46am.

The life of tires manufactured by Omega Tires Inc is believed to be normally distributed with a mean of 110,000 km and a standard deviation of 5,000 km. A random sample

of 200 tires is tested . What is the problability of the mean life of this sample being between 109,000 and 111,000 km?

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