15 years of experience is between what two numbers

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A sample of 9 managers with over 15 years of experience has an average salary of \$71,000 and a sample standard deviation of \$18,000.

Assuming that the salaries of managers with over 15 years experience are normally distributed, you can be 95% confident that the mean salary for all managers with at least 15 years of experience is between what two numbers?

What is the lower and upper limit?

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