The Lifetime of a Certain Type of Automobile Tire (In $\mu = 43$

question 52

Multiple Choice

The lifetime of a certain type of automobile tire (in thousands of miles) is normally distributed with mean $\mu = 43$ and standard deviation $\sigma = 5$ . What proportion of tires have lifetimes between 40 and 50 thousand miles?

• A) 0.6450
• B) 2.0000
• C) 0.3550
• D) 1.1935

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