Question
1.A spark plug manufacturer claims that the lives of its plugs are normally distributed with a mean of 60,000 miles and a standard deviation of
1.A spark plug manufacturer claims that the lives of its plugs are normally distributed with a mean of 60,000 miles and a standard deviation of 4,000 miles. A random sample of 16 plugs had an average life of 58,500 miles. If the manufacturer's claim is correct, what is the probability of finding a sample mean of 58,500 or less?
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High School Math 2011 Algebra 1(prentice Hall)
Authors: Prentice Hall
Student Edition
9780133500400, 0133500403
