The Tread Life of a Particular Brand of Tire Is

question 123

Multiple Choice

The tread life of a particular brand of tire is a random variable best described by a normal distribution with a mean of 60,000 miles and a standard deviation of 1700 miles. What is the probability a certain tire of this brand will last between 56,430 miles and 56,940 miles?

• A) .0180
• B) .9813
• C) .4920
• D) .4649

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