The Lifetime of a Certain Type of Automobile Tire (In $\mu = 39$

question 31

Multiple Choice

The lifetime of a certain type of automobile tire (in thousands of miles) is normally distributed with mean $\mu = 39$ and standard deviation $\sigma = 6$ . What proportion of tires have lifetimes greater than 48 Thousand miles?

• A) 0.4666
• B) 0.0668
• C) 0.5334
• D) 0.9332

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