Sure Stone Tire Company Has Established That the Useful Life

question 54

Multiple Choice

Sure Stone Tire Company has established that the useful life of a particular brand of its automobile tires is normally distributed with a mean of 40,000 kilometres and a standard deviation of 5000 kilometres.What is the probability that a randomly selected tire of this brand has a life of at most 30,000 kilometres?

• A)0.5000
• B)0.4772
• C)0.0228
• D)0.9772
• E)1.0000

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