The wearout mileage of a sparky all whether is normally


The wearout mileage of a Sparky All Whether is normally distributed with a mean of 25000 miles and a standard deviation of 2300 miles.

If manufacturer guarantees that the tires last at least 23850 miles, what percentage of tires will live up to the guarantee?  

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Mathematics: The wearout mileage of a sparky all whether is normally
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