Truck Tire Life Is Normally Distributed with a Mean of 60,000

question 44

Multiple Choice

Truck tire life is normally distributed with a mean of 60,000 miles and a standard deviation of 4,000 miles. For a set of four tires, what is the probability that the average tire life is between 57,000 and 63,000 miles?

• A) 0.4332
• B) 0.8664
• C) 1.00
• D) Very likely

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