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January 27, 2015

January 27, 2015

Posted by **Tiffany** on Friday, February 11, 2011 at 10:33pm.

The top selling Red and Voss is rated 70,000 miles, which means nothing. In fact, the distance the tires can run until they wear out is a normally distributed random variable with a mean of 82,000 miles and a standard deviation of 6,400 miles.

a) What is the probability that the tire wears out before 70,000 miles?

b) What is the probability that the tire last more than 100,000miles?

- Math & Stats -
**PsyDAG**, Saturday, February 12, 2011 at 1:07pmZ = (score-mean)/SD

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportions related to your Z scores.

- Math & Stats -
**Kimberly**, Saturday, February 12, 2011 at 10:28pmThank you PSyDAG

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