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b) A spark plug manufacturer believes that his plug lasts an average of 30,000 miles, with a standard deviation of 2,500 miles. What is the

b) A spark plug manufacturer believes that his plug lasts an average of 30,000 miles,

with a standard deviation of 2,500 miles. What is the probability that a given spark

plug of this type will last 37,500 miles before replacement?

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